Hmmm! You have absolutely stumped me and a whole bunch of support folks and engineers here with this one. The only thing we can think may be going on here is that you've reactivated Duo Mobile for your administrator account, so you can get pushes for accessing the Duo Admin Panel, but not you haven't reactivated your user account in order to access applications and have it added back into the Duo Mobile home screen. Please try deleting the app again, reinstalling it, and make sure you've reactivated both.
If that doesn't solve your issue, please reach out to our Support Team at your earliest convenience so we can do some in-depth troubleshooting.