The following pages include useful information for resolving issues with Microsoft Intune:

Troubleshooting app installation issues

https://docs.microsoft.com/en-us/troubleshoot/mem/intune/troubleshoot-app-install

Troubleshooting mobile application management

https://docs.microsoft.com/en-us/troubleshoot/mem/intune/troubleshoot-mam

Basic app protection troubleshooting

https://docs.microsoft.com/en-us/troubleshoot/mem/intune/troubleshoot-app-protection-policy-deployment

Validating policy message

After the Intune sign-in, the iManage Work Mobility app displays a message that it’s trying to validate the policies.
https://docs.microsoft.com/en-us/troubleshoot/mem/intune/troubleshoot-device-enrollment-in-intune#users-iosipados-device-is-stuck-on-an-enrollment-screen-for-more-than-10-minutes

Policy change issues

After updating a policy setting, the changes do not appear to be updated in the iManage Work Mobility app.
https://docs.microsoft.com/en-us/troubleshoot/mem/intune/troubleshoot-app-protection-policy-deployment#scenario-policy-changes-are-not-working

Sign in errors 

If a user signs in using their Office 365 email and mistakenly enters their email address incorrectly within the app,

and then corrects the address in the following Application Logon screen,

the user will receive an error message followed by a Microsoft 365 Authentication sign in failure.

In this scenario, the user must tap Cancel on the Application Logon screen and re-enter their correct email address on the initial sign in screen.