Can't find device in HomeApp

[lumenhu]

WI-FI connected is OK，IP：192.168.1.108
but when I adding the device to my home, I cannot find the device in Home App.
I confirmed that my iPhone and my HomePod are connected to the same Wi-Fi.
The monitor said:
Free heap: 37104, HomeKit clients:0
Free heap: 37104, HomeKit clients:0
…
The free heap seemed like a fixed number.

I tried to use my phone Hotspots, connected my iPhone and HomePod to the Hotspots and changed the SSID and password in Arduino.
I found and paired the device in Home App successfully. It worked very well.