Venmo made it impossible by giving error codes during bank account and routining number input which was copy and paste. The account being selected for the transfer was already approved.
Out of frustration I tried the instant transfer with a fee and like magic the very same account t which wouldn't work for the free transfer worked for the instant with fees.
When I masked for a refund, Venmo provided a list of documents and verifications before Venmo would consider the request.