Add to Group Button Issue

Hello, in:
Webmin --> Webmin Users , i have a webmin group; if i select a user and click on [Add to Group:] , button work like the [Delete Users] button.
And got: Failed to delete users : One of the selected users is marked as non-editable.

I use:
Debian 8.2
Webmin version 1.760
Virtualmin version 4.18
Theme version Authentic Theme 16.01

PS: I tried a fresh virtualmin install on a local vm, issue is present only with virtual server .. without virtual server button work as expect.

Status: 
Active

Comments

Is the user you are trying to add one that was created by Virtualmin, as a domain owner?

Yes. i also tried with more user, everyone is the virtual server administrator, same issue.

So it is expected that adding a Virtualmin domain owner to a group will fail like this - these users are managed entirely by Virtualmin, and so cannot be edited on the Webmin Users page.

The error message is a bit confusing though - I will fix that.

Ok. So is not possibile to add, example, a filemin group with tuned permission.

The supported way to do this is at System Settings -> Server Templates -> Default settings -> Webmin login, using the "Webmin group for domain owners" field.