Allow me to assist you in connecting your bank and ensuring all your transactions are properly synced.
Before we proceed, could you let me know if you've encountered an error message while attempting to connect to Monzo? This will help us identify the issue and provide the most accurate solution.
To start, please visit your bank’s website to check for any announcements about ongoing maintenance or updates they might be performing that might be impacting the connection with QuickBooks. If there are no issues on your bank’s side, you can manually refresh the bank account connection in QuickBooks.