If ever a Xero organisation becomes disconnected from Futrli, there is an option within Xero itself that might help you reconnect the organisation.
In Xero, log in to the relevant organisation in question.
In your settings organisation settings, you should see Connected Apps.
Here you will find listed the third party apps connected to the Xero organisation.
Locate Futrli Predict, then click Disconnect. Don't worry - this will have no impact on anything you have done in Futrli (only deleting the organisation in Futrli will result in losing work).
Head back into Futrli, to reconnect the organisation integrated with Xero.