ProtonMail Down?
So what if ProtonMail is down? This can be caused due to server maintenance, network issues, or some of their internal issues. To confirm, you can check the official status page at the ProtonMail Status Page to see if they are experiencing an ongoing outage or if it’s a maintenance window. You can also check other users' experiences regarding the app on third-party sites such as Downdetector.
In a situation where you do not notice an outage, this suggests that the problem might be occurring on your end. Start by refreshing your browser or app and ensuring you have sufficient internet connectivity. Clear your browser’s cache and cookies, or try using a different browser. If there are any issues with the mobile app, update the app to the latest version, or, if necessary, delete and reinstall the app.
Otherwise, send them a message using their official website. You are required not to leave them in suspense, and they should be able to assist. However, refrain from letting downtime get in the way of communication—stay updated and connected with ProtonMail.
More Info: https://www.resetprotonpassword.com/
More Info: https://www.resetprotonpassword.com/recovering-your-proton-account-password/