diff --git a/.changeset/violet-beds-promise.md b/.changeset/violet-beds-promise.md
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+---
+'@backstage/core-components': patch
+'@backstage/core-plugin-api': patch
+'@backstage/app-defaults': patch
+'@backstage/core-app-api': patch
+'@backstage/plugin-auth-backend': patch
+'@backstage/plugin-auth-node': patch
+---
+
+Fix error handling using authentication redirect flow via `enableExperimentalRedirectFlow` config. If an error is caught during authentication, the user is redirected back to app origin with `?error=true` query parameter. A cookie is also set in the redirect which contains the error message. The error can be fetched from any custom sign in page using the new `AuthErrorApi` and `getSignInError()` implementation. Example:
+
+```ts
+import { useApi, authErrorApiRef } from '@backstage/core-plugin-api';
+
+const authErrorApi = useApi(authErrorApiRef);
+const errorResponse = await authErrorApi.getSignInAuthError();
+```