Error using Hopper referral credit "we couldn't verify you payment details"

Has anyone else referred friends to Hopper to get free credit then when you
attempt to use it…

“Oh shoot. We couldn’t confirm your payment details.” error message?

I tried various of my cards, didn’t work.

I contacted the support but said then don’t know what’s the cause :face_with_raised_eyebrow::man_facepalming:

Have anyone solved this?