I have the same problem. I've spent hours on the phone with QBO support with no answers. They are the ones that actually sent me the link to this thread. I followed the instructions above to the letter and still was unable to link my LOC account. The funny thing is I have an existing line of credit that for several years has been linked and transactions are uploaded daily without issue. It was originally set up in my chart of accounts as a credit card. I tried doing that same thing with the new LOC to no avail. Baffling an incredibly frustrating