I can provide a second confirmation now that CapitalOne + Zelle + Google Voice definitely does not work. I just spent an hour on the phone with four different service agents on the CapitalOne side, and indeed, they cannot confirm that my Google Voice phone number is associated with my name. Forcing confirmation via SMS is something new (within the last few months) at CapitalOne. I believe they made this change shortly after the switchover from ClearXchange to Zelle. In any case, stay away from this payment option unless you have access to a US phone number that is registered under your own name. Google Voice just will not work.