Why doesn't Gmail work now?

If Gmail does not deliver messages to your inbox, try sending an email to yourself. It will determine if the problem lies in sending or receiving the emails. If that fails, try switching to a different browser or device, since the problem may be specific to the software or hardware that you are currently using.

Why is Gmail Not Working?

https://googlsuportfaq.medium.com/why-is-gmail-not-working-b491a1903abb