I'm getting this problem too.
"When I click 'Register Now' to sign up for my prepaid Verizon reward, it redirects me to Verizon VTP page and it does nothing. It just says "Retrieving Customer Data" and does nothing. What should I do?"
from
https://forums.verizon.com/t5/My-Verizon-Account/Visa-Prepaid-Reward-Card-Registration/m-p/869444
Seems I found the answer in this topic:
https://forums.verizon.com/t5/My-Verizon-Account/FIOS-Welcome-Bonus-Link/m-p/867571#M20072
