Proton Bridge login error can be stressful. This is because Proton Bridge acts as a bridge between your secure and encrypted ProtonMail account and email clients such as Outlook, Thunderbird, or Apple Mail. This means that any issues concerning the login to Bridge should be addressed in the shortest time possible. Below are some steps that can be used to resolve such issues:
First, check to ensure that you have a stable internet connection because more often than not, it is a poor connection that causes problems in logging in. Secondly, ensure that you have the correct details concerning the ProtonMail account, including a username and password. Also, keep in mind that every password is case-sensitive. Therefore, you have to make sure that the caps lock is off on your keyboard.
In the case where you are confident that you have logged in with valid credentials but are still unable to log in, make sure to restart Proton Bridge and your computer to eliminate any possible temporary issues. Occasionally, the use of outdated versions of Proton Bridge may create some conflicts, so ensure the latest updated version is installed from the ProtonMail website.
Also, there may be security software in use that is preventing the operation of the Bridge. Some antivirus or firewall configurations might interfere with Proton Bridge even after its installation. All these programs need to connect to ProtonMail servers through gateways called client bridges. Either of these security programs can be disabled temporarily to check if they are responsible for the login problems that were experienced.
In the case of prolonged problems, you can also consider attaining help from ProtonMail support. It is not possible to find a problem yourself with such details, over the course of each patient interaction.
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More Info: https://www.bigpondonlineservice.com/blog/how-to-reset-bigpond-telstrausername-or-email-password/