Sometimes while trying to add a new connection that uses OAuth authentication flow(for eg: Quickbooks connector) within an automation having multiple connections, it gets automatically connected to the previously linked user instead of redirecting it to the login page of the system.
A possible solution for this would be to log out from one account before logging into the other account if we want to add multiple connections of the same system. Please refer below video which shows up how to manually logout from a quickbooks account and then retry adding up a new connection for quickbooks within an automation