Hi there, @Simmo70.

I'm here to make sure you can connect your bank to QuickBooks Online.

First, let's confirm you have the correct user ID and password for the bank account:

1. Open a new window in your web browser and go directly to your bank’s website.
2. Make a note of the web address (e.g. https://www.bank.com). This may come in handy later.
3. Sign in with the user ID and password you have. If you have separate accounts with the bank (such as a business account and a personal account), sign in to the account you want to fix in QuickBooks.
4. If you sign in successfully, then you know the user ID and password are correct. If you get a sign-in error, follow your bank’s instructions to get your user ID, reset your password, or both.

After that, sign in to your bank account in QuickBooks. For the detailed steps, refer to this article and proceed to step 2: Enter your bank sign-in info in QuickBooks.

These articles will take you through some troubleshooting steps for bank error codes:

• Fix Specific Bank Errors
• Troubleshoot Unknown Bank Errors

If there's anything else that I can help you with, please let me know in the comments sections below. I'll be here to lend a hand.