I can confirm the same from my side.
All my Thread Devices (Nuki Lock and Eve Plugs) are not more responding since upgrade to TvOS26/iOS26.
Rebooting is without effect.
So my smart lock is no more manageable.
Thanks for the feedback.
Yes I was already on the new Apple Home Architecture.
Everything was working perfectly before TvOS26 upgrade.
I will open a ticket to Nuki Support.
Unfortunately already done…
I have seen that all Thread Matter devices are out of service but I have one Thread HomeKit Device (Eve Water Leak Dectector) which is still working…
So I think this is related to the Thread Matter 1.4 upgrade on Apple TV…
I needed 44 (!!!) trials before, all of a sudden, without doing any of the „resets“ as suggested by the Nuki HelpDesk, a few hours ago the Nuki lock finally was „registered“ via Matter in Apple Home. My other Matter devices (11: 8 Freedompro light/blinds-switches, 3 Eve devices) were „migrated“ without any trouble. Therefore I still suspect the problem to be Nuki-related.
Well…. I DID work BUT after less than 24 hours, roughly 2 hours ago, the Nuki lock became „not reachable“ in the Apple Home app…. And the same old story once again: the Nuki lock does not want to „onboard“ via Matter in the Apple Home app. All my other Matter devices (Eve, Freedompro) still work without any problem. What is wrong with Nuki and Matter???
I am not sure what did the trick but I gave my “house” in the Apple Home app another name and used only 1 word (before: 2). I also charged the Nuki battery-pack ((it was 62%) to 100%. And all of a sudden the “onboarding” via Matter in the Apple Home app worked……