How to unbind my mini? No Device Management option in the app

[Spinball]

Hi folks, so I'm handing my Mini to its new owner tomorrow and I want to unbind it from my account.
However, there is no Device Management option in the DJI Fly app.
(I can see the record of the flights with my Mini in the Flight Data Centre).
So how do I unbind it?
Thanks

 

[mavic3usa]

I could be wrong but I don't believe there is a binding option available for the Mavic Mini aka Mini 1.