A. 1. Re-link your account: Go to the account settings in the app and try unlinking and then re-linking your account. Make sure you are using the correct credentials. 2. Check for app updates: Ensure you have the latest version of the app, as updates may fix bugs related to account linking.

B. 3. Clear app data: Go to Settings > Apps > HoYoLAB > Storage > Clear Data. Note that this will log you out, so ensure you have your login details handy.