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Get-IPv6StatusForAcceptedDomain

Use the Get-IPv6StatusForAcceptedDomain cmdlet to view the status of support for mail delivery to accepted domains in Exchange Online using IPv6. Exchange PowerShell reference

From the Exchange PowerShell reference 3 parameters Its page in the reference

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Parameters

3 in the Exchange PowerShell reference
-DomainThe Domain parameter specifies the accepted domain that you want to view IPv6 status for.
-Confirm, -cfThis parameter is reserved for internal Microsoft use.
-WhatIf, -wiThis parameter is reserved for internal Microsoft use.