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Test-SiteMailbox

Use the Test-SiteMailbox cmdlet to test the site mailbox to Microsoft SharePoint connectivity and to test whether users have the correct permissions to use a site mailbox. Exchange PowerShell reference

From the Exchange PowerShell reference 7 parameters Its page in the reference

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Parameters

7 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the site mailbox that you want to test.
-BypassOwnerCheckThe BypassOwnerCheck parameter is used when the account that's running the command isn't a member or owner of the site mailbox.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-RequestorIdentityThe RequestorIdentity parameter specifies the user to test for correct permissions to the SharePoint site mailbox.
-SharePointUrlThe SharePointUrl parameter specifies the SharePoint URL where the site mailbox is hosted, for example, "https://myserver/teams/edu".
-UseAppTokenOnlyThe UseAppTokenOnly switch specifies that you want to test the site mailbox by using the identity of the Exchange server.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.