Can't Add Retainers to Subscription

[Dekent]

I had the same issue, what fixed it was deleting my payment info on file and putting in a new one while buying the retainer, for some reason they didn't want to add the retainer to the one I was using to pay my sub with.

[Rorosy]

Thank you so much! That was exactly it. I deleted my old payment method, tried adding a retainer, and it all worked!