Administrators may have started to notice our diagnostics starting to render within the M365 Admin Center support portal for certain text queries as early as December 2018. Please refer to our previous diagnostic blog post How to troubleshoot issues in SharePoint Online and OneDrive with diagnostics.
How to ensure I can use the diagnostic?
From the Microsoft 365 Admin portal select Support > New Service Request and type Diag: Classic View to Modern to render the diagnostic.
What does this diagnostic evaluate?
Evaluates that a view can render in Modern mode.
What tenant and SharePoint checks does it complete?
For additional details, see SharePoint Online Lists and Libraries Modern View Compatibility check
and Customizing "modern" lists and libraries.
Validates that page is compatible with Modern mode.
Validates various page related properties.
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