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Enable-DnssecForVerifiedDomain

Use the Enable-DnssecForVerifiedDomain cmdlet to enable Domain Name System Security (DNSSEC) for inbound mail to accepted domains in Exchange Online. 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
-DomainNameThe DomainName parameter specifies the accepted domain in the Exchange Online organization where you want to enable DNSSEC (for example, contoso.com).
-Confirm, -cfThis parameter is reserved for internal Microsoft use.
-WhatIf, -wiThis parameter is reserved for internal Microsoft use.