Can't add new devices with HomeKit
So I have a few smart devices that can be added with homekit like apple TV and my homepod mini, they've just worked fine but when I have to add another device like Aqara hub and Tado v3 AC smart controller I'm having troubles. Both are completely new (just purchased to keep building my smart home).
The first message is: "Connecting to accessory. This may take a few minutes".
Then, without success, the second message displayed is: "Unable to Add Accessory. Home couldn't connect to this accessory."
I can't figure out what's happening. I have all my devices connected to my 2.4 ghz wifi network and I also have some other smart devices (not compatible with homekit) working well.
I've just also followed all this instructions: https://support.apple.com/en-us/HT204893
Do you know what's happening?
iPhone 11, iOS 14