Everytime I restart Thunderbird, it keeps showing dupe nags that login to Outlooks failed.

I run up-to-date Thunderbird in Sandboxie Plus to help protect my setup from accidental setting clicks or virus attachments.
This setup worked fine until March 2022, but now every time I restart, Sandboxed Thunderbird keeps asking me to re-enter Outlook passwords. I then installed the latest version of Plus, but to no avail.

"login to server imap-mail.outlook.com with username [my email address] failed" is the error in the dialog box, which shows me a button to re-enter my password. I used app passes for the 2FA'd MS accounts, and ordinary passes for my non-2FA'd MS Accounts. I tried lowering the maximum number of connections to 1, but I read somewhere that this doesn't need to be done after TB versions 68 onwards. I'm on the latest TB versions.

Furthermore, I don't experience these issues when run outside Sandboxie.
So it's not my settings. But before anyone asks, I used these settings:
I used the settings from here: https://answers.microsoft.com/en-us...tlookcom/266ddd8f-250c-4e8a-9799-009d992be8e3
from bullet points #8 to #9.

Please help me fix this, so I can reliably run Thunderbird sandboxed.

 

This happened to me yesterday when opening Thunderbird UNsandboxed, so it may be more of a Thunderbird issue than Sandboxie. I opened Thunderbird on several machines to update them, and the error only happened on one machine & with one outlook address (one that I've had for ages, so not newly added to TB). I did not enter the password; I just closed the error box instead, then after a few minutes I clicked "Get messages" for the affected outlook email address and it downloaded all the emails just fine without any issues or errors. Not sure if it's the same root cause or error but just putting it out there. I never run TB under Sandboxie myself.

 

It's not the same issue.
Your issue is not "Everytime I restart".
And my issue is not that I can't "Get New Messages".