There is some UAC inconsistency that prevents the built-in account from working normally.
Receive the following error message if you open Windows settings -> Network -> Adapter settings

The following workaround solves the issue.
Setting Admin Approval Mode for the built-in Administrator account policy to enabled solves the issue.
A Defect request was submitted to have this issue resolved in a future release of RMAD.
Defect number: 382523