Hi there, Jo Nelson.
Thank you for joining the Community. It would be my pleasure to help answer any question you may have with your bank in QuickBooks Online.
I've checked here, and we haven't received any reports about this error message from the NatWest bank. Allow me to share some insights about this banking code.
This error happens when your bank's website rejects the login attempt due to your account already logged on. For more insight on how you can get rid of the error, I recommend visiting this article:
Fix banking error 179 in QuickBooks Online.
Please keep in touch with me here should you have any additional Banking concerns. The Community wants to make sure you're in good hands.
