I was using iPhone X max and Iphone 11 max pro just got , trying remember for sure both were plugged in power like cord , i ensured both had Bluetooth on , 12.4.1 update was on both, the old phone has find me iPhone turned off , for first few tries just had no option so locked old phone then rebooted new one let it turn on where was saying Hola then unlock old phone and it would see the other phone and get option set up , keep in mind new iPhone 11 pro max was clean meaning like a reset phone as I didn’t set it up at all , in one of the tries I reset new iPhone 11 pro max to factory settings just because I went to far in set up thinking may get option later, and we’re next to each other obviously the old phone also had backup iCloud turned off