Found this on another site and I'm hoping this isn't what needs to happen because I don't have access to it:
By changing the computer from the domain to a workgroup, you have
destroyed the trust between the domain and the machine. In doing so,
you have also rendered your domain login credentials as invalid. You
need to be physically connected to the domain network, you need to have
administrative privileges to the workstation, and you need to have
administrative privileges on the domain. Then you can add the machine
back on to the domain, after having first deleted the computer's old
domain account (unless you've also renamed the computer)
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