In the device compliant report in Office 365, you can see which mobile devices are not compliant with the mobile device policies you've deployed in Mobile Device Management for Office 365.
View the device compliant report
To view the report,
Go to the Security & Compliance Center > Reporting.
Select Device compliant report.
Understanding the device compliant report
The Device compliant report identifies:
devices that are compliant
devices that are not compliant but still have access to your organization's data in Office 365
devices that are not compliant but whose access to your organization's data is blocked
To view the device compliant report, you must be an Office 365 global admin.
You can also get to the Device compliant report by going to the Office 365 admin center > Mobile device management > See device compliant report.