In case you are not able to log into your ProtonMail account, this may be due to a server outage, an unsupported browser, or any account-related issues. To confirm that the service is not experiencing any outages or maintenance activities, first visit the ProtonMail Status Page at status.proton.me.
If the servers are functioning, check if your browser is updated and supported by ProtonMail. Then, clear the browser’s cookies and cache, and try to log in again. If that doesn't work and you use the ProtonMail app, you may want to update it to the latest version.

If login information is not entered correctly, it can also block access to the account. Enter your username and password correctly one more time. If your password was changed recently, use the most recent one. Otherwise, please ask a ProtonMail support representative for further assistance in order to protect your account from such issues.

Finally, be informed and prepared by updating your recovery methods, recovery email, or two-factor authentication methods. Contact the support team of ProtonMail for further assistance if the problem extends over time.

More Info: https://www.resetprotonpassword.com/how-to-reset-my-password-for-protonmail/

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