XPS 13 9310 - Service Tag not recognized

Hello,

A few months ago, I bought used XPS 13 9310 from reseller. I don't know anything about history of this laptop, but It just works. Except one: Service Tag wasn't programmed in the BIOS. I had option to write something in that field, so I write code from bottom case under "ST" placement.

Unfortunately, DELL cannot recognized it in any other place than "Add product" under Account settings. It found information about the model, but I see badge with note "Problem with technical supports services" (don't quote me here, I translated it from my language).

I'll never try to resolve it, because laptop just works (any problems with Windows license), but I always have problems with drivers and DELL additional tools which required Service Tag.

Do you have any ideas what's happen here? For clarity, the only what I want is using drivers and tools from DELL -- if laptop was previously bought by company or something like that and there are other rules than "normal" consumer market, I don't want to re transfer any rights to me (or something like that).