I logged into my PC today (from locked screen). There was no problem. I attempted to run my apps, and I received bad gateway errors from the calls to my flows that load initial data. I then had a Windows notification (a fly-in on the bottom right - Win 10) that said that my login credentials needed in some way revalidated (I forget the actual wording, it went kind of quick). It did appear to be a windows notification, not powerapps.
I logged out of windows, then on first attempt, I was locked out. I had to contact my IT department to get unlocked. I have a non-expiring password, and there was nothing on their side that indicated anything more than just a normal lockout from invalid attempts.
I logged in, and my apps ran fine. No problems at all.
Now, I have another user haivng similar symptoms. Same bad gateway error. It could be something else, but I suspect not since its acting similarly.
Did you have gateways installed on a computer, such as laptop? This is not recommended. It may be turned off, asleep, or not connected to the Internet because the gateway can't run under any of those circumstances. In addition, gateway performance might suffer over a wireless network.
In addition, I do not think that windows notification has anything to do with PowerApps credentials, since PowerApps works online.
Community Support Team _ Mona Li If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.