My client has a federal credit union. The routing # starts with 263. I keep getting this error: The routing transit number (RTN) for the electronic deposit of refund is invalid. The RTN should be nine characters long and must start with 01 thru 12 or 21 thru 32. RTNs are validated against a check digit, which is the ninth digit of the RTN. If the computed check digit does not match the check digit input, the electronic deposit cannot be directly credited.

Has anyone seen this before and how can I fix it?