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PowerShell DnsServer module and DKIM 2048-bit keys
I haven't checked 2019 yet but 2016's Add-DnsServerResourceRecord cmdlet can't handle a key that goes beyond the 255 character limit. The mmc for DNS appears to support this just fine. I've tried...
Might try asking for help over here on QnA
windows-server-powershell - Microsoft Q&A
or report this as feedback over here on uservoice
PowerShell: Hot (1955 ideas) – Windows Server (uservoice.com)