Changing wifi network

If you mean,
You did not press the pin at the bottom for over 29 seconds:
Still “your” Pro doesn’t show up in the mobile app, you probably started/selected a new instance of the free trial version of Homey Cloud.
It can be recognised by it’s icon, a house, and it’s description “Homey” :

You’re not the first one mixing things up, it’s not very transparent

To add your Pro again, goto

  • …More
  • hit Homey (below your account)
  • hit “+ Add new Homey”

This somewhat confusing command, also adds existing Homey’s to the app.

NOTE: you can create offline backups of a Pro 2023, however it’s not possible when it’s running.
With a Cloud backup subscription, backups are created automatically whilst Homey’s running.