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The Office 365 Client Performance Analyzer (OCPA) has been deprecated. You can still use the Exchange Analyzer via the Microsoft Support and Recovery Assistant. The SharePoint Analyzer is deprecated as well.
To Run the Exchange Analyzer tests in Support and Recovery Assistant, go to Advanced Diagnostic > Exchange Online > Check Exchange Online network connectivity > Yes.
Read Fix Outlook and Office 365 issues with Microsoft Support and Recovery Assistant for Office 365 to learn more about Support and Recovery Assistant.