It sounds basic, but if your session timed out or a temporary glitch occurred during loading, a quick refresh (F5 or Cmd+R) can prompt the login box to reappear or fix a handshake error. 3. Log Out and Log Back In
A means the server received your request, but it won’t let you in because you lack valid authentication. Essentially, the website doesn't know who you are or your login credentials aren't checking out.
If you use WordPress, a security plugin (like Wordfence) might be misidentifying you as a threat.
If you’re seeing this on your own site, the issue is likely in your configuration: