Maybe I missed something, and I tried going back to make sure I didn't... but what is the password for accessing the SQL server?
$yourusername="windowsnoob\niall"
I kept this as TRUE:
$ADDCURRENTUSERASSQLADMIN="True"
But it gives me a "the certificate chain was issued by an authority that is not trusted." I added "TrustServerCertificate=True" to the Additional Connection Parameters but then it gives me a bad login error.
Thanks for any information.
EDIT:
Running SQL Management Studio as administrator fixed the issue.