I just purchased new Hue Bridge Pro & migrated one of the previous (out of two hue bridges) hue bridge. Lo & behold, Homey Pro can’t find the bridge and all the previous lights (~25) disappeared.
Tried all the steps of adding lights via Hue app in Homey but it’ll not discover the new Hue Bridge Pro. The app will however find the remaining old hue bridge but somehow will not detect the new Hue bridge pro. Also tried adding the device through its matter passcode but no luck.
I’m in the same situation. Could migrate the Hue Bridge (v2) flawless to Hue Bridge Pro (v3) with the iOS Hue App (very nice job from Philips) . Integration into Apples HomeKit again, was also no issue.
Atoms Philips Hue app 7.1.1 for Homey Pro does currently not support the new bridge with an official stable version. The Homey support told me, that the Hue Bridge Pro should be supported in about two weeks. Their goal is it, to automatically fix flow issues due to changed device settings from migration.
In the Dutch Forum you can find a link to the Beta version 7.1.4 of the Homey Philips Hue app, which should work due to user feedbacks.
I didn’t do the Beta test and I’m probably waiting for the final release. Till then, unfortunately without light automation. – That’s life, should have checked before migration.
And with that, I will close this topic to not splinter this topic more, any further questions can be found/asked in the “official” topic about the new Philips Hue Bridge Pro.
If you disagree with this decision, feel free to contact me or any other Moderator.
. Integration into Apples HomeKit again, was also no issue. 
