I am connecting QB online to a Capital One 360 Spark Business account. I was getting the 107 error. I called Spark Business and they helped me get reconnected.
On the Capital one 360 side click the profile button (the silhouette on the upper right) then in the left navigation, click access codes and make sure you have an access username and code created. If not, click the "Create Access Code" button.
Then on the QB Online side where it asks you to "Enter the bank name or URL" start typing Capital One 360 and then you will be presented with more options other than the Capital One icon that's displayed at the bottom of the page. Entering the URL never worked for me, but once I was able to select Capital One 360 then I was able to authenticate, insure that I was not a robot, and 90 days of transactions appeared in QB.
Good luck. Not intuitive QB. Glad Capital One was able to help me.