Domain parking on your XtGem site
Settings - Domain parking
You cannot park these domains to xtgem sites .ml .np .tk .ct .ga
Other domains may be added to this list at any time
The reason these are blocked is most of these have a reputation for revoking your domain and redirecting to a scam site
Or revoking your domain and just leaving sites that do not work any more if you have used the domain in your code and links.
Any others can be parked once you have purchased your domain from a broker (ie:
XtGem do not sell domains
You can park up to three domains to one xtgem site
To park a domain to a XtGem site