I have this same issue (like every time - not once has it connected the first time) and have done one of the two things and so far it has resolved the issue. In the Banking page:
1) After I pressed the Update button and it fails there is a warning that comes up:
We can’t find this account at your bank
Let’s make sure the right accounts are connected to QuickBooks. This may take a few minutes.
Reconnect your account
I click on Reconnect which sometimes actually works.
2) What works the best though (is actually the same idea just done differently) I click on the small bank icon in the small box that shows the name of your bank account, account number, and account balance (usually blue or gray). The small icon is located in the upper right corner. When I click on this, let it do it's thing, then refresh the page, it works. You must refresh the page though.
I hope maybe this helps!
