Nitai B. I brought this problem to Rex during one of the office sessions, but not officialy in a post, and he agreed it was a bug.
If you try to login with gmail in your Computer Configuration Mode, the session persists during the workflow. So the session is stored, and it should be. But with MS oauth specifically it doesn't work.
It's a critical problem to the company because it requires MFA. So our internal clients can authenticate once a day for example, but not every 10 min
Also, it's not a problem from the Microsoft side, if I enter in a default browser, the session is kept for 24h. But not in lindy's machine.