can't activate rebate

rhsortho wrote:

Got the "congrats you're approved" email for the $100 prepaid mastercard promo they ran when i signed up for 5g home internet in December.  However when trying to "activate" the rebate (entering the phone number and "text from image"...it comes back with we were not able to validate information provided.

Anyone else running into this?  Not looking forward to calling customer service.