If you have successfully downloaded all your bank transactions, you may want to categorize and match them. This will help make sure your transactions are in the correct accounts when adding them to QuickBooks.
Should you need any additional assistance while managing your bank transactions, you can leave a comment below. I'll be sure to get back to you, @nbaig-baiglaw-co.
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.