I just got my Galaxy Note 8 tonight and registered it on the Samsung Website, I got an email for a gift right away, but it's for 50% off any Samsung Accessories under $50. I registered my device on the Samsung website, but I wanted the $25 Google play credit! I already got all my accessories for it, before I went and bought it tonight. I'm going to call them and find out why I got that instead of the $25 google play credit.
Update: I talked to samsung and they were no help, except to get me to the Samsung Perks website where the $25 google play credit was. Once I tried to get it though, using my existing samsung account, which worked on the Samsung Website, it kept telling me my password was wrong even though it worked on Samsung main site. I ended up figuring out that my password had to have numbers and letters in it, which it didn't before. So I made a new account with my Comcast email and it went through by making a password with letters and numbers. So got it after all. Only thing is, I ordered a drawing/painting app and when I uninstalled it, still had the deduction from my $25 google credit. I'm thinking they'll just credit my Debit card back the credit, because it was uninstalled before the 15 minute limit. Hope this helps someone else get their credit, because Samsung was no help.