deactivating bank feeds

Good job for performing some troubleshooting steps ahead, fcraig. 

Let's run the Verify and Rebuild Data utilities to ensure there are no integrity issues and the company file is error free.

Here’s how:

1. Go to the File menu and hover to Utilities.
2. Click Verify Data and let it run for a moment.
3. Hit OK if prompted that there are no problems with you data.
4. If QuickBooks detected that your data has lost integrity, let’s perform the Rebuild Data process.
5. Go back to File > Utilities and then click Rebuild Data.
6. Click OK if you receive a message to backup your company file.
7. The rebuild data will start once backup is finished.
8. Hit OK when prompted that Rebuild has completed.

Then, we can merge the accounts again. Let’s make sure that there are no existing transactions on the account where you’ll move the information to. Please follow the steps in the Solution 2: Merge the account with a new one section of the article.

We can review your Chart of Accounts (Ctrl + A) afterwards to verify if the lightning bolt of the bank account you'll want to disconnect disappeared. 

Let me know if there's anything else that you need help with. 

I have encountered the same exact error over the weekend.  I too followed the steps mentioned in this and other threads and even tried manually exporting my COA, updating the IIF file to set the flag to N, but the reimport failed.  I also tried activating my bank by logging in, but I received an error there as well.  I was chatting with support (Jeziel Ann B) before they abruptly ended it, but the end result was that QuickBooks would not help with this issue unless I upgraded to the $299 subscription or $49 for a one time call, even though it seems like it is a pervasive issue.  Any other advice?