Hello i tried to migrate cpanel tar.gz backup file into virtualmin but it has subdomains in it and thats why virtualmin migration tool gives this error:
“validation failed : More than one domain name was found in the cPanel backup virtualmin”
Restore the top level domain first. In the migrate dialogue there’s an option to work out the domain to restore from backup or list the domain. List only the primary domain and restore it only. Then go back and migrate the others.