CmdID

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Add-RecipientPermission

Use the Add-RecipientPermission cmdlet to add SendAs permission to users in a cloud-based organization. Exchange PowerShell reference

From the Exchange PowerShell reference 5 parameters Its page in the reference

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Parameters

5 in the Exchange PowerShell reference
-IdentityThe Identity parameter specifies the target recipient.
-AccessRightsThe AccessRights parameter specifies the permission that you want to add for the trustee on the target recipient.
-TrusteeThe Trustee parameter specifies the user or group that receives SendAs permission on the recipient specified by the Identity parameter.
-Confirm, -cfThe Confirm switch specifies whether to show or hide the confirmation prompt.
-WhatIf, -wiThe WhatIf switch shows what the command does without making any changes.