Solved Error This Operation is only allowed for the Primary Domain Controller of the domain with Add-Computer

[scottalanmiller]

When using Add-Computer in PowerShell to join to a domain, I am getting this error:

This Operation is only allowed for the Primary Domain Controller of the domain

But I can't see why.

Add-Computer -DomainName "mydomain"

[scottalanmiller]

Turns out that it needed the -Credential flag, which Microsoft doesn't document as a requirement. This worked find...

Add-Computer -DomainName "mydomain" -Credential mydomain\myusername