Cant add more Aqara devices

Because you already asked the question in the Aqara thread and don’t seem to have received a personal answer. I guess that you didn’t read the thread. Solutions are suggested there, e.g. resetting the Zigbee network. This should not be the case anymore with Homey FW v5.0.0, but it seems that one or the other user has to do it anyway. So I would also suggest to contact Athom additionally.

Zigbee channel: This can be disturbed by other Zigbee bridges or by the WLAN.
There are also already various threads about this, including this one:

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