I also have the problem of registering it. It was directly purchased through Samsung Unlocked, either they haven't attached the new IMEIs of all S20 phones or it's a 1:100000 chance this goes wrong with everyone. 🙁
So now I'm having issue with my imei number its saying that its invalid! Which I'm not understanding because this number is EVERYWHERE!! Contact Samsung support they claim its because its a new device smh! I ended up talking to some over chat and he took my issue down and hopefully they resolve the issue because I really wanted to be able to get that promotion after I pre-order my device ! Also my devices is through sprint so I'm not sure what the issue is. Showing up phone on my members app but the shop Samsung app its not.
I pre-ordered through T-Mobile and I'm having the same issue. I called Samsung and I was told that it takes a day or two to register in their system that I got the phone and to look out for an email. Still nothing.
Thank you for reaching out. The Redemption period for the promotion is 3/5/2020 - 4/20/2020. Give this link a try for further assistance: https://www.samsung.com/us/mobile/galaxy-s20-5g/offers/getmore/frequently-asked-questions/
I think everyone is having this issues, even peole who bought it through other retailers(Not just Sprint). You have until 4/20 to redeem it so there is nothing we can do but wait.