Possible user profile corruption preventing taskuser from fully logging in.

[markcor]

Describe the bug
Intermittently, after task user logins, there is a desktop pop-up with a warning of "We can't sign in to your account". Either the pop-up or the condition triggering the warning is causing FXCI tests to fail. I am still digging through logs to understand the test failure.

Example: https://firefox-ci-tc.services.mozilla.com/tasks/atmYr7ngQbWWitfIMaWiSg#artifacts

To Reproduce
There is no apparent pattern. Currently, unknown how to reproduce.

Expected behavior
No pop-up/warning. The task user being able to fully log in and access its environment.

Taskcluster version
First notice on 60.3.4
And continues on 64.2.5

Screenshots

https://firefoxci.taskcluster-artifacts.net/atmYr7ngQbWWitfIMaWiSg/0/public/test_info/browsertime-results/paypal/pages/www_paypal_com/myaccount/summary/cold/data/video/1-original.mp4

Platform (please complete the following information):

• OS: Windows 11 2009

Additional context
I am currently working on finding a specific cause and a workaround for now.