I had this same issue however did manage to find a solution without wasting my time with customer service thankfully. I bank with a small credit union and my account number is only 6 digits long which works just fine for 99.9% of transactions. On my checkbook however my account number actually shows a sequence of 5 numbers before my account number (all 1s & 0s) plus a further 2 digits after my account number which denotes checking or saving account. I entered in the entire number exactly as shown on checkbook and this went straight through no problem. From experience dont bother wasting your time trying to get any help out of paypal customer service.
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