The support will still answer to the original steam account that it was bought with. Had this with my steamdeck which i bought over a friends account because he was a few months earlier than my reservation and didn’t need it. I didn’t use my reservation in the end but his. When i needed a replacement, the support first answered that i did not have a steamdeck, that it belongs to someone else and they would send it to him. But the original address that we put in was mine, so i could prove that i was the owner and it worked out in the end. But i just wanted to let you know that he be careful when using the support because the serial number is still registered to the ordering steam account.