Unfortunately I've had the same problem. I don't know why every time the question was asked in this thread that people answered with exactly the same steps as the prior person. It is so frustrating.
Here is what I did:
We have three bank accounts. Two connect seamlessly to QBO, the third cannot connect due to the PW management on the bank end so I have to upload the transactions. I want it on the Banking dashboard for obvious reasons. If I go through the COA as outlined above, it just will not connect. I searched and was equally frustrated. It seems every time you ask this specific question, tech help tells you how to connect through the COA. I kept digging on my own.
1. go to the banking dashboard
2. click the arrow next to "Link Account"
3. Select "Manage Connections"
4. You will see a list of all bank accounts. Flip the button next to the account you want to connect to green.
5. It'll try to get you to sign on, just go through the motions and put anything in there. when it fails, you will see the account on the Banking Dashboard. I had to do this twice for it to work.
Good luck.
