I think the only current solution is to have PWA add your pc + IP manually to your account. This seems to have started when they implemented Google Authenticator for 2FA or shortly thereafter when something went weird with the mail system.
My guess is broken API call or outdated credentials. Good luck getting it fixed lol, don't even know who active PWA is tbh. There should really be a message added to elaborate why the authentication fail but at the moment, its nonexistent.