We have some users with M365 E1 plan and PowerApp trial license. They can sign-in PowerApp on iPhone before. Last week, we released some new apps and asked them sign-in to test. Two of them reported when they sign-in they got an error. (sorry I didn't have the screenshot. But I remember the error message is quite meaningless. Something like "you have an error signing in".)
They have update their PowerApps app in App store. Tried kill app and restart still the same error. So I gave them the PowerApp url and asked them to test sign-in from browser. When they sign-in, Microsoft asked them select the region. They choose Asia and then the browser become blank white.
However, right after that, they find they can sign-in on iPhone. So do you know what's the issue?

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