Verify Mailbox Accessibility via EWS

 You can verify independently if a mailbox is accessible using EWS with the following steps:

      1. Go to https://testconnectivity.microsoft.com
      2. If using Microsoft 365, click the Microsoft 365 tab.
      3. Select Service Account Access (Developers) then click Next.
      4. Specify the target mailbox email address.
      5. Specify the service account user name. If using admin credentials on the connector, enter the exact same user name.
      6. Specify the service account password. If using admin credentials on the connector, enter the exact same password.
      7. Check Specify Exchange Web Services URL and enter the FQDN of the Exchange Web Service (EWS) Server. For example, if the EWS URL is https://mail.contoso.com/EWS/Exchange.asmx, then enter mail.contoso.com.
      8. If using an Exchange Server, do not check Use Exchange Impersonation. If you are using Microsoft 365, and using impersonation, do check the box.
      9. Check Ignore Trust for SSL.
      10. Click Perform Test.
      11. Once results are displayed, check the overall result, and click Expand All.

It may be necessary to first manage permissions.

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