There have been multiple reports of Pokemon GO handing out strikes preventing play to those who own certain Redmi devices. This pattern has been linked to MIUI 10.3.2.0, a recent firmware update for the phones affected. Niantic, the AR game's developer, has announced that it is now working on trying to revise them.
https://www.notebookcheck.net/Pokemon-GO-reportedly-bans-Android-players-for-running-a-certain-version-of-MIUI.436962.0.html