An expired session means ProfCalendar cannot authenticate further sync requests. Your account has not been deleted.
- Read the banner and note any unsynced event changes before signing in again.
- Use the sign-in action and the same Google account or email as before.
- After signing in, check that your shared calendars return and request a sync.
Signing out clears Android’s local data, including pending edits. Do not repeatedly sign out as a sync repair. If you cannot sign in, reset your password from the sign-in page.
If it still doesn't work
Check sync help or contact support. Tell us the app version and what you tried; never send passwords or private calendar contents.