You can first check the compatibility of each platform for Matter device access, Apple, Google and Amazon are different, and some types of devices are currently not supported by them. Perhaps we could spend some time compiling and maintaining a list of devices supported by each platform that ihost can access via matter.
The iHost pairing via Matter on Alexa stopped working about a week ago here at home. I deleted the device and tried to pair it again and now it is no longer working, an error message appears after some time trying to connect. Was there any instability after updating the new version of eWeLink Cube?