Selected my bank, logged in ok, chose acc to upload, got this notice-Looks like you're already signed into the NatWest offshore - Online Banking site on another device ?

Hi paul-tostevin

We presume that you receiving a 179 error alongside the message. You state that you have the banking app, we would be grateful if you can turn off/un-toggle the background app refresh on your related devices and then attempt to update/connect your account within QuickBooks.