I did it through Samsung browser and it worked. The difference between the two I found was that Samsung browser requested me to upload an image of my imei.
Try again pal. I was trying for 1 hour!
No email. No text.
Now when I try to claim it says my IMEI has already claimed the buds. Absolute joke.
I have the exact same issue. I have emailed firstname.lastname@example.org about this but the annoying thing is they are mostly likely out of office till monday now.