When you meet this issue, you can check if the app: Microsoft Authenticator is installed on your phone and you have signed it with your Microsoft account. If it does, please try to fix this by following way:
1. Long press the app: Microsoft Authenticator and go to the app info page.
2. Click: Force stop option
After 10 minutes, if this issue still can't be fixed, please feel free to send a feedback to us.