I had same warning and it will resolve itself in time. Think it took a week for my error to resolve.
Post when I asked about the warning:
https://forum.virtualmin.com/t/license-warning/136479
For now just focus on rebuilding server 
I had same warning and it will resolve itself in time. Think it took a week for my error to resolve.
Post when I asked about the warning:
https://forum.virtualmin.com/t/license-warning/136479
For now just focus on rebuilding server