I'm trying to pay a vendor, they sent me a link to the online invoice so I could pay them.  I filled out the details (business checking, rtg number, acc number) and it threw the error

Payment declined.  Your payment method was declined. Please use another method or try again.

I checked with my bank (Bank Of America) and they say there are no restrictions on the account that would cause this.  I then tried to pay with an old PNC bank account and the payment went through fine.  How can I get more details on the error?  The error shown on the website is less than helpful and I need to resolve this before I can close the old account.  Any ideas greatly appreciated.