The Homing keeps failing during the Nebula Pad setup .
You need the latest firmware.
For those that have trouble with this and may find this response, when setting up the Nebula pad on Ender 3 v2, there are FOUR total options for setup:
Mainboard ver. 4.2.2
Mainboard ver 4.2.2 with CR Touch
Mainboard ver. 4.2.7
Mainboard ver. 4.2.7 with CR Touch
The first option presented is the 4.2.7 version, my mainboard is a 4.2.2. I selected the wrong version, and got the homing failure. Be sure to select the correct mainboard (Either pop the bottom cover off and look, or if you used one, try the other) and this should resolve your issue! Better documentation from Creality of this would have been appreciated as, it is not clear unless you happen to scroll past your model printer!