Authentication Error, All Settings Good

Hi, this seems to be a strange issue. I have a hotmail.com and outlook.com account as well as gmail. The hotmail one was in general use/default. It recently stopped authenticating over my main PC Thunderbird installation. The PC is a new build and was listed as a "known device" in the MS account settings. I tried removing it and it seems to not matter. But it all worked fine for awhile up until Meadows. It has authenticated a handful of times since then, particularly if I'm logged into the MSN account via the web, but not always. I've tried changing to POP instead of IMAP and that removes the authentication error pop up message but it still won't update the folders/doesn't work. There's just no error message, so I changed the server settings back to IMAP. It's all the same settings as worked previously including on this very computer. The same settings work with the outlook.com email, including on Thunderbird on this PC. But that wasn't in daily use or as default. The one that's no longer authenticating however was. I've tried switching to a new profile and it doesn't work. Tried reinstalling Thunderbird and deleting old profiles to fully recreate, doesn't help. Outgoing on this same failed account does work, only incoming will not Authenticate or update. I have a laptop with a Win 11 and Thunderbird setup similar to as on the PC, works fine on the laptop with the same settings. In creating the accounts the "test server settings" feature returns no errors as well. I can't tell where the actual source of failure is beyond that as the error message isn't very detailed or informative and based on the overall behaviour where it works flawlessly on the laptop, worked with those very settings previously on the now failing install, still works very rarely as well, up to and including on this same PC via Outlook program or over the web, with all the same settings. So it seems specific to Thunderbird, post Meadows update, on this PC, with only that email. To further clarify, I have a second outlook.com based email, which still works with Thunderbird on this PC where the hotmail based account fails authentication. I also have tested the failing email via the Outlook program on this PC, including over the web by logging in with Firefox, that all works, just like it works with the laptop. What I haven't tried to do when reinstalling Thunderbird is scrape every hint of prior installs out of it, but I did delete all of the profiles folders and content. I also just tried creating a new profile and making it the default. None of that helped. Thanks