Aqara and Xiaomi (and Tuya) are all infamously known for making firmware that does not exactly follow all the Zigbee specifications and especially infamous for not working well with (some) other brands of Zigbee Router devices (mains-powered Zigbee devices paired/joined on your network that act as Zigbee repeaters/extenders).
To start with, best practice tip it is to upgrade firmware on your ConBee Zigbee Coordinator adapter.
Secondly, follow this generic guide that include best practice tips should be following regardless:
That guide also more specifically including a link to a other guide that is specific to Aqara and Xiaomi:
I think the best tip from there is to at least not use " Zigbee repeaters reported NOT to work with Xiaomi devices" and instead only use " Zigbee repeaters reported to work with Xiaomi devices".
Another tip specific to Aqara and Xiaomi mentioned there is that Aqara and Xiaomi devices are infamously known for not automatically moving to a better Zigbee Router device if you add such later, so you will need to manually re-pair each and every Aqara and Xiaomi device after you added more Zigbee Router devices for them to connect via a closer Zigbee repeater/extender.
While it does not help, the saying “you get what you pay for” applies to Aqara and Xiaomi (and Tuya).
@MatthewFlorida You did also not perfectly clarify if you are actually using specifically using Home Assistant’s ZHA integration (the built-in native Zigbee Gateway), or using third-party Zigbee gateways like Zigbee2MQTT, or deCONZ (Phoscon), which is it? I suspect you are specicially using Dresden-Elektronik’s deCONZ Gateway (and their Phoscon App) since you mentioned it, but perfectly clear it is not, however it need to be clear becaise this “Zigbee” section in Home Assistant’s communulity forum is primarly meant to about Home Assistant’s native ZHA (built-in Zigbee gateway) integration → Zigbee Home Automation - Home Assistant (and using devices with it) as all third-party Zigbee gateways have their own communities which discuss stuff that is not Home Assistant specific. See example:
There is however also a single thread in Home Assistant dedicated to the deCONZ integration here: