Have you encountered any errors while linking your account, such as error codes 102 or 105? These errors are related to bank maintenance, so it’s best to check the CBA website directly. Log in to see if there are any pending security verifications, new terms and conditions that need your acceptance.
If everything seems fine on their end, try opening QuickBooks Online in a private or incognito window to eliminate any potential cache-related issues. You can also switch to a different browser to further troubleshoot the problem.
While this gets resolved, you can manually upload your transactions. Once your bank feed starts syncing again, you may notice some duplicate entries. You can easily manage these by excluding them.
This thread remains open if you need additional help with banking connectivity in QuickBooks.