Set "http_domain_filter" to false in default settings.
While using a single URL for provisioning may seem easier, it is a little less secure and might make it harder for tracking assets.
If you have access to the manufacturers' auto provisioning system (RPS,GAPS,ZTP,etc) then it is fairly simple to setup the correct URL for each tenant as equipment is ordered and/or sold. This method also helps with tracking inventory, tenant equipment, etc.