"Service unavailable" when attempting to add a United States (US) bank account

If you are receiving the "Service unavailable"-error when adding a bank account for United States (US) domestic wire funding, you are entering an ACH routing number instead of a wire routing number. 

Ensure that you are entering a wire routing number and not an ACH routing number when adding a US bank account. 

Kraken does not currently support ACH bank transfers.