Re: Besides, I am using Android Pie. Not sure if it is related.
Could be, I don't know. Maybe InTune app has an issue with that?
I just know that - and see from the log - that we do "ask" the InTune app to "let the user pick an account and return its info back to us" - and instead it's asking you to sign in, as if your corporate account did not already exist there.
1 - Can you try this app, would it work?
This uses Microsoft's Official Library That Works With InTune (tm) called ADAL
https://www.aqua-mail.com/download/Office365Login-app-release.apkJust to get an additional data point.
When you run this app it will try to log you in.
I just need a "did it work or not" - yes / no - and if it fails too, would it fail the same way as Aqua.
2 - Can you try rebooting the phone just in case?
In my experience InTune app is "finicky"
putting it mildly.