Hi,
I have a laptop and I see the Dell keep placing the service hold on the system without understanding or explaining the root cause.
The most common cause is a system not registered to the person making the warranty claim.
Are you registered as the owner with Dell? If the system was purchased through a third party (reseller, used, Amazon storefront, etc.) you will need the assistance of the seller to transfer ownership.
But I already transfered the warranty before they placed the hold on the tag.
You'll need to ask Dell about your case, but note that transferring ownership and transferring a warranty are distinct. They are not the same thing.
A system purchased in one country can have ownership transferred, but a warranty transfer will be denied if it's a basic 12-month warranty (not applicable out of the country of purchase). Another recurring one is if a system was initially sold in a country where Dell is now prohibited from doing business (there are two in Europe) -- those systems are orphans now, having no Dell support.