Yes, some addons need you to show your validation token which is for one URL and normally that is your live site. (you see this when you click on the Customers link on the home xenforo page)
It may be that the best thing is to replace that temporarily with your test site domain initially, then you will get a vaildation token for that test domain
Alternatively contact the addon developer and explain
However I would suggest you contact the xenforo team to ask the best way to do this.