I just linked Chase in HSBC using full 15 digit account number including the six leading zeros 2 days ago, and had no problem doing that. Pending ACH Debit HSBC ONLINE TRIALDEBIT WEB $0.87 Pending ACH Credit HSBC ONLINE TRIALCREDT PPD $0.49 Pending ACH Credit HSBC ONLINE TRIALCREDT PPD $0.38