diff --git a/workspaces/github/.changeset/github-issues-group-host-resolution.md b/workspaces/github/.changeset/github-issues-group-host-resolution.md
new file mode 100644
index 00000000000..56926c3cca6
--- /dev/null
+++ b/workspaces/github/.changeset/github-issues-group-host-resolution.md
@@ -0,0 +1,7 @@
+---
+'@backstage-community/plugin-github-issues': patch
+---
+
+Fixed the GitHub Issues card crashing with `TypeError: Failed to construct 'URL': Invalid URL` for `Group` and `User` entities whose `backstage.io/source-location` / `backstage.io/managed-by-location` is not a parseable URL (for example entities registered from a `file:` location, or with no location at all).
+
+For owner entities (`Group`/`User`) the card now resolves the GitHub host from the configured `integrations.github` instead of the owner entity's location annotation — the same approach used by the `github-pull-requests-board` plugin — so a team simply sees the open issues of every repository it owns. `getHostnameFromEntity` is now non-throwing, and repositories whose host cannot be determined are no longer silently dropped.
diff --git a/workspaces/github/plugins/github-issues/README.md b/workspaces/github/plugins/github-issues/README.md
index d19eca162e0..6856fb355f8 100644
--- a/workspaces/github/plugins/github-issues/README.md
+++ b/workspaces/github/plugins/github-issues/README.md
@@ -6,8 +6,13 @@ Welcome to the GitHub Issues plugin!
 > Backstage UI (BUI) is now required for the GitHub Issues plugin to function, BUI has been included as part of Backstage since `1.41.0` which means you're very likely to already have it installed. The [BUI documentation](https://ui.backstage.io/) has details on installation if needed and the Backstage [User Interface documentation](https://backstage.io/docs/conf/user-interface/) has details on creating a custom BUI theme.
 
 Based on the [well-known GitHub slug annotation](https://backstage.io/docs/features/software-catalog/well-known-annotations#githubcomproject-slug) associated with the Entity, it renders the list of Open issues in GitHub.
-The plugin will attempt to determine the source code location using the [well-known Source location slug annotation](https://backstage.io/docs/features/software-catalog/well-known-annotations/#backstageiosource-location) or [Managed by location slug annotation](https://backstage.io/docs/features/software-catalog/well-known-annotations/#backstageiomanaged-by-location) associated with the Entity.
-If no configured Github provider will match, the first one will be used.
+
+The GitHub host (and therefore which `integrations.github` credentials are used) is resolved depending on the Entity kind:
+
+- **Group / User**: the host is taken from the configured GitHub integration, **not** from the owner entity's location annotation. This means owners ingested from a non-GitHub source — e.g. Microsoft Entra / Microsoft Graph (`msgraph:`), LDAP, or a static `org.yaml` — work correctly and no longer crash the card. The repositories are taken from the [`github.com/project-slug`](https://backstage.io/docs/features/software-catalog/well-known-annotations#githubcomproject-slug) annotation of the Components the Entity owns, so a `github.com/team-slug` annotation on the Group/User is not required.
+- **All other kinds** (e.g. Component): the host is determined from the entity's [Source location](https://backstage.io/docs/features/software-catalog/well-known-annotations/#backstageiosource-location) or [Managed by location](https://backstage.io/docs/features/software-catalog/well-known-annotations/#backstageiomanaged-by-location) annotation.
+
+If no configured GitHub provider matches the resolved host, the first configured integration is used.
 
 The plugin is designed to work with any Entity kind, and it behaves a bit differently depending on the target kind:
 
diff --git a/workspaces/github/plugins/github-issues/src/api/githubIssuesApi.ts b/workspaces/github/plugins/github-issues/src/api/githubIssuesApi.ts
index 2f1e3ceec94..4dcd7203f75 100644
--- a/workspaces/github/plugins/github-issues/src/api/githubIssuesApi.ts
+++ b/workspaces/github/plugins/github-issues/src/api/githubIssuesApi.ts
@@ -24,7 +24,7 @@ import { ScmAuthApi } from '@backstage/integration-react';
 /** @internal */
 export type Repository = {
   name: string;
-  locationHostname: string;
+  locationHostname?: string;
 };
 /** @internal */
 export type Assignee = {
@@ -115,7 +115,7 @@ export const githubIssuesApi = (
   configApi: ConfigApi,
   errorApi: ErrorApi,
 ) => {
-  const getOctokit = async (hostname: string) => {
+  const getOctokit = async (hostname?: string) => {
     const configs = readGithubIntegrationConfigs(
       configApi.getOptionalConfigArray('integrations.github') ?? [],
     );
@@ -140,7 +140,7 @@ export const githubIssuesApi = (
   const fetchIssuesByRepoFromGithub = async (
     repos: Array<Repository>,
     itemsPerRepo: number,
-    hostname: string,
+    hostname?: string,
     {
       filterBy,
       orderBy = {
@@ -152,8 +152,11 @@ export const githubIssuesApi = (
     const { octokit, host } = await getOctokit(hostname);
     const safeNames: Array<string> = [];
     const repositories = repos
-      // only tries to fetch issues from repositories that are hosted on the same GitHub instance as the octokit
-      .filter(repo => repo.locationHostname === host)
+      // Only fetch issues from repositories hosted on the same GitHub instance
+      // as the octokit. Repositories whose host could not be determined (no
+      // usable location annotation) are assumed to live on the resolved host,
+      // so they are kept rather than silently dropped.
+      .filter(repo => !repo.locationHostname || repo.locationHostname === host)
       .map(repo => {
         const [owner, name] = repo.name.split('/');
 
diff --git a/workspaces/github/plugins/github-issues/src/components/GithubIssues/GithubIssues.test.tsx b/workspaces/github/plugins/github-issues/src/components/GithubIssues/GithubIssues.test.tsx
index e451e58c344..a2b1fea9631 100644
--- a/workspaces/github/plugins/github-issues/src/components/GithubIssues/GithubIssues.test.tsx
+++ b/workspaces/github/plugins/github-issues/src/components/GithubIssues/GithubIssues.test.tsx
@@ -280,6 +280,64 @@ describe('GithubIssues', () => {
       );
     });
 
+    it('should render Group issues when the group has no annotations (no team-slug or location)', async () => {
+      // Regression test: a Group with no annotations at all. Previously the card
+      // crashed with "Failed to construct 'URL': Invalid URL" because it parsed
+      // the group's source/managed-by location to determine the host. The host
+      // is now resolved from the configured integration, and the repositories
+      // come from the components owned by the group (their github.com/project-slug),
+      // so neither github.com/team-slug nor a location annotation is required.
+      const testIssue = getTestIssue({
+        repository: { nameWithOwner: 'backstage/owned-repo' },
+      });
+
+      const ownedComponent = makeEntityWithKind('Component', {
+        name: 'owned-repo',
+        spec: { type: 'service', lifecycle: 'production', owner: 'my-team' },
+      });
+
+      const catalogApiWithOwned = {
+        getEntities: async () => ({ items: [ownedComponent] }),
+      } as CatalogApi;
+
+      const groupWithoutAnnotations = {
+        metadata: {
+          name: 'my-team',
+        },
+        spec: { type: 'team', children: [] },
+        apiVersion: 'backstage.io/v1alpha1',
+        kind: 'Group',
+      } as unknown as Entity;
+
+      const mockApi: GithubIssuesApi = {
+        fetchIssuesByRepoFromGithub: async () => ({
+          'owned-repo': {
+            issues: {
+              totalCount: 1,
+              edges: [testIssue],
+            },
+          },
+        }),
+      } as GithubIssuesApi;
+
+      const apis = [
+        [githubIssuesApiRef, mockApi],
+        [catalogApiRef, catalogApiWithOwned],
+      ] as const;
+
+      const { getByTestId } = await renderInTestApp(
+        <TestApiProvider apis={apis}>
+          <EntityProvider entity={groupWithoutAnnotations}>
+            <GithubIssues />
+          </EntityProvider>
+        </TestApiProvider>,
+      );
+
+      expect(getByTestId(`issue-${testIssue.node.url}`)).toHaveTextContent(
+        testIssue.node.title,
+      );
+    });
+
     it('should render correctly when there are no issues in GitHub for kind: User', async () => {
       const ownedComponent = makeEntityWithKind('Component', {
         name: 'owned-repo',
diff --git a/workspaces/github/plugins/github-issues/src/hooks/useEntityGithubRepositories.ts b/workspaces/github/plugins/github-issues/src/hooks/useEntityGithubRepositories.ts
index 26e24a47e15..4492a249b05 100644
--- a/workspaces/github/plugins/github-issues/src/hooks/useEntityGithubRepositories.ts
+++ b/workspaces/github/plugins/github-issues/src/hooks/useEntityGithubRepositories.ts
@@ -30,9 +30,22 @@ export const getProjectNameFromEntity = (entity: Entity): string => {
   return entity?.metadata.annotations?.[GITHUB_PROJECT_SLUG_ANNOTATION] ?? '';
 };
 
-export const getHostnameFromEntity = (entity: Entity): string => {
-  const { target } = getEntitySourceLocation(entity);
-  return new URL(target).hostname;
+export const getHostnameFromEntity = (entity: Entity): string | undefined => {
+  try {
+    const { target } = getEntitySourceLocation(entity);
+    // The location type (`url`, `github`, `gitlab`, ...) is not a reliable
+    // signal here: a non-`url` type can still carry a parseable URL target.
+    // Attempt to parse the host regardless of type and let the `catch` handle
+    // targets that are not URLs.
+    return new URL(target).hostname;
+  } catch {
+    // The entity has no usable URL source/managed-by location (e.g. it was
+    // registered from a non-URL location such as `file:`, or has no location
+    // annotation at all). The GitHub host is resolved from the configured
+    // integration instead, so fall back to `undefined` rather than throwing
+    // and crashing the card with "Failed to construct 'URL': Invalid URL".
+    return undefined;
+  }
 };
 
 export function useEntityGithubRepositories() {
diff --git a/workspaces/github/plugins/github-issues/src/hooks/useGetIssuesByRepoFromGithub.ts b/workspaces/github/plugins/github-issues/src/hooks/useGetIssuesByRepoFromGithub.ts
index 37134d7f059..f39b668edba 100644
--- a/workspaces/github/plugins/github-issues/src/hooks/useGetIssuesByRepoFromGithub.ts
+++ b/workspaces/github/plugins/github-issues/src/hooks/useGetIssuesByRepoFromGithub.ts
@@ -31,7 +31,14 @@ export const useGetIssuesByRepoFromGithub = (
 ) => {
   const githubIssuesApi = useApi(githubIssuesApiRef);
   const { entity } = useEntity();
-  const hostname = getHostnameFromEntity(entity);
+  // For Group/User entities the issues come from the *owned* repositories, not
+  // from the owner entity itself. Its own source/managed-by location therefore
+  // must not constrain the GitHub host — and is frequently a non-URL location
+  // that used to crash the card. Let the API resolve the host from the
+  // configured `integrations.github`, the same way the
+  // github-pull-requests-board plugin does.
+  const isOwnerEntity = entity.kind === 'Group' || entity.kind === 'User';
+  const hostname = isOwnerEntity ? undefined : getHostnameFromEntity(entity);
 
   const {
     value: issues,