Hello conkandco-outloo,

There seems to be a change in provider name from Credit Union Australia to Great Southern Bank as well as website login change, therefore leading to this connection issue. Engineers are aware and working on a fix to accommodate these changes. I'd recommend contacting our Customer Care Team. You can provide this INV-72419 so they can track your concern. They'll add you to the list of affected users.

In the meantime, you can import your bank transactions manually so you're still on top of running your business. Here's an article for the detailed steps: Manually upload transactions into QuickBooks Online.

Post again if you need help with QuickBooks Online.