Initial situation
An app was published by company A in the App Store about 1 year ago and now has some subscribers and ratings.
Objective
The app is to be further developed by company B and offered in the App Store without the subscribers having to actively accompany the change (cancel old subscription with A and take out new subscription with B).
The transfer is described in detail here and initially shows no obvious hurdles:
https://help.apple.com/app-store-connect/#/deved688524f
Has anyone had practical experience with this and can recommend important do's and dont's?