Everything went smoothly in migrating, followed instructions to the letter. Old hub powered off, new hub powered on. It looks the same but no Zigbee devices respond, and the Zigbee logs are empty.
Rebuilt the network, rebooted the Zigbee radio, all the stuff I've seen people recommend for Zigbee problems on C8. Including switching antennas.
I'll reiterate because it's a question that gets repeated - old hub is powered off and removed from the network. C8 is the only hub, migrated from the cloud backup created.
Any help appreciated - although I suspect the Zigbee radio is dead. I bought C8 the moment I heard it was out (my third hub now), but only just found the time after traveling to try it, so I'm now outside the 90 day warranty.
This is not possible, as the C-8 was released on February 28, less than half that time ago. If your hub is over 90 days old, it is at most a C-7, but it sounds like you have the "rebuild" option that is only on a C-8 and should then be within the warranty period if you suspect hardware is the problem.
Assuming your old hub still works, you can also try going back and making another backup and migrating that one to see if anything changes.
Judging by all the posts about this exact scenario, it looks like it could be widespread.. I need to reconnect my C8 and see if I can pair new zigbee devices to it.
I'd still try -- they are known to help, and may be especially interested with it being the new C-8.
Also not sure what the "all the stuff" you've tried is, but if you haven't tried moving the hub or lowering the Zigbee power to see if that helps (e.g., if it's interference from other 2.4 devices in that exact spot), they would also be worth trying. If you aren't on the latest version, at least a couple of which have been released since your post, there are also fixes for Zigbee issues in both. Hardware problems are rare but do happen; Support should be able to look at your logs and likely figure something out either way.
