@pc10 

Hi, Thank you very much for your time and patience.

Were you still having the reported issue?

I saw a similar post here: https://www.reddit.com/r/HomeKit/comments/1h1qkba/apple_tv_4k_cannot_work_as_home_hub_when/

The OP here mentioned the following test results:

"I did some more troubleshooting using laptops and found that

1. ⁠Multicast from wired to wired is fine

2. ⁠Multicast from wireless to wireless is fine

3. ⁠Multicast between wired and wireless fails

So looks like the router doesn’t allow multicast between wired and wireless. And I read that the HomeKit Hub role requires mDNS to function, so makes sense."

Deco doesn't support local DNS reslution either. I wonder if that might be the problem.

Wait for your reply and best regards.