FM's documentation for TB was updated to include info for TB 115 shortly after I submitted a support ticket for a similar problem.
My OS is Ubuntu 20.04 and it has TB installed via Ubuntu repos and via Flatpak. TB-Flatpak updated to v115 in mid-July IIRC. My repo installation is still at v102.x.
In my instance, after TB-Flatpak updated to v115 the *TB account* in my *TB profile* with credentials to access my *FM account* was able to sync messages in my FM account. However, when TB-Flatpak was running it kept launching a popup window requesting my FM account's username and password to authenticate access to my FM calendar.
The popup authentication window would not accept the FM app password I had created for that TB profile. That app password had permissions for messages, CalDAV and CardDav. I was wary of using my FM username & master password. Through the FM support ticket exchange I learned TB 115 had been updated to accept OAuth2 authentication.
After getting to grips with AOuth2, authenticating my TB-Flatpak account to access my FM calendar was straightforward and uneventful. Enter username & password in the popup window's fields, enter 2FA code. Bingo, all good.
When I first setup this profile and its FM account TB was unable to sync natively with FM contacts. At that time the workaround suggested in FM's documentation for TB setup was to use the CardBook extension.
Both TB 115 and the current version of TB 102.x can natively sync one's FM contacts. This relies on AOuth2 authentication too.
In short, to setup a new TB account to access your FM account you will need an FM app password to get started. OAuth2 only comes into the picture when trying to sync the new TB account with your FM calendars and contacts.
I have no idea why you are getting an empty (presumably blank or vacant) popup window. Did you use an FM app password in the first TB account authentication step?
Quote:
Originally Posted by Folio
UPDATE: I tried a completely new installation of Thunderbird 115 and setting up Fastmail went completely smoothly -- no problems at all. But, then I found myself unable to add my Gmail account. So, I've gone back to Thunderbird 102.
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Be careful when going backwards and forwards between TB 102 and TB 115. TB 115 modifies profiles such that they become incompatible with TB 102. Make sure you backup your TB 102 profile before moving it to TB 115.
A short while ago I created a new TB profile to access a Gmail account. I
think I used TB 115. The profile is in the collection of profiles used with TB-Flatpak (TB 115). Setup went without a hitch.