@RockSolid OKC @mcavinder 

Try opening your QBO account on any private/incognito browser. Another option, utilize the trial version of MT Online to isolate the issue. It is designed to import into any bank or credit card in QuickBooks Online, so there is no specific setting needed. If the same error persists, there is an ongoing problem at your bank or connection.

https://www.moneythumb.com/?ref=110