Situation: One of our users can’t login GloablProtect and gets DUO Authentication failed error.
Troubleshooting: When we check the user logs, we see Location Unknown and No Response.
Case 1: It sounds to me like you may have changed some device settings with your Android phone that caused the Duo Mobile app to deactivate, and you should be able to authenticate again once you follow the steps to reactivate the app.
Case 2: I have the same problem after disabling the account of DUO-PROTECTED on the DUO app.
