Hi leonieyoung06,

Thanks for joining the thread. Engineers have implemented a solution to resolve the bank feed connection with Great Southern Bank (formally CUA) provider.

For the fix to be effective, kindly follow below steps to reconnect.

1. Sign into QuickBooks Online.
2. Go to Transactions or Banking tab. 
3. Select the tile for the account, then select the Pencil icon. 
4. Select Edit sign-in info button. 
5. Update your online banking credential to reconnect. 

You can check on this article for more detailed steps on how to fix bank error 103.

Feel free to post again if you need any help with your bank feed. Have a nice day!