I realize this thread is over 2 months old, but I have a suggestion. Instead of using Quickbooks to reach out online to retrieve the bank data, get it yourself. Most banks allow for transactions to be downloaded within whatever dates you specify in several different file formats. (CSV, Quicken, Quickbooks, Excel, etc.) Obviously you want Quickbooks. Sign into your bank's web portal, view your account details and figure out how to do such a download. Quarterly is a good date range. Save it someplace where you can easily find it. Now, with your company file OPEN, locate the downloaded *.qbo file and double click it. Quickbooks should either find the account you wish to update or it will prompt you to select one. Worst case, you will have to create a new account. I had something similar happen to Quicken a while back and this was my workaround. Works for both as long as your product isn't sunsetted. 

Now if anyone knows if the bank feed still works after sunset for transactions already read into Quickbooks but not yet matched, I'm all ears. I have QB2019 and sunset occurs at midnight tonight.