Hello and welcome to the Community, olliesrandomacts
We're aware of an issue where some customers are receiving the error "Something unexpected happened and we can’t connect to PayPal (for UK users). Try again in a few hours. (590)" when connecting or updating their PayPal account in QuickBooks Online.
You have clicked a link to a site outside of the QuickBooks or ProFile Communities. By clicking "Continue", you will leave the community and be taken to that site instead.