So, I have two gmail accounts and recently turned on 2-step for both of them. I also access both using thunderbird on my home PC and on my laptop at work. Generating app passwords for these accounts generally works, for a time, but invariably thunderbird will start returning the error "Login to server imap.gmail.com failed." for one or both of them. This happens on both machines with equal frequency. Also weird is that sometimes it will work fine until I send an e-mail, then the error will pop up when it tries to save to the sent folder after sending the e-mail. Logging into the relevant google account and revoking then re-generating a new app password will fix the issue temporarily, but it's only a matter of time before I have to do so again. This has been ongoing for about a month, and I can find no pattern to when the passwords seem to stop working. I'm pretty much at my wits end about this... If any setting or other info would help I'm happy to post, just tell me what info would be relevant.