Cannot link Commonwealth bank account, any ideas?

Try opening your QBO account on any private/incognito browser. Did you encounter the same problem?

Let's troubleshoot the Commonwealth Bank error you're experiencing, Elizabeth.

First, log in to your Commonwealth Bank account. Copy the URL and paste it into QuickBooks to confirm that the connection is successful. Next, check if there are any additional security requirements you need to address, such as a one-time passcode or token code for your online banking.
 
Additionally, log in to your online banking website to see if any messages or updates require your attention.

Once you’ve completed these steps, return to the Bank Transactions tab in QuickBooks and update your bank sign-in information.

Here's how:

1. Go to the Transactions tab and select Bank transactions.
2. Choose your bank account.
3. Click Edit, then select Edit sign-in info.
4. Manually input your bank's User ID and password.
5. Click Save and connect.

Finally, check if the error has been resolved and the new transactions have been downloaded.

Feel free to check out this article for guidance on resolving bank errors: Fix error 103 when you connect your bank to QuickBooks Online or QuickBooks Self-Employed.

If you have any additional concerns, don’t hesitate to post in the Community again.