Context:

Users may encounter an “Authentication failed” error when trying to log in if their device’s clock is not set correctly. Ensuring that “Set time automatically” is enabled in the phone’s Date & Time settings will resolve the issue.

What to do:

The “Authentication failed” error typically happens when your device’s date and time are out of sync. To resolve:

1. Open your phone’s Settings.
2. Tap Date & Time.
3. Enable “Set time automatically” (or “Automatic date & time”) so your device stays in sync with the network.
4. Try logging in again.

Once your clock is set automatically, the authentication process should succeed without error and you should be able to log in successfully.