When ESP32 is used as STA, it cannot connect to another ESP32 which is used as AP

[pandabiu]

I use the ESP32 CSI Toolkit and want to collect CSI between 2 ESP32s
For the ESP32 is used as STA:it can connect to my mobile hotspot and collect CSI.
For the ESP32 is used as AP:I can find it on my phone and it allows mobile phone access,collect CSI.
The problem that I faced is when I want to connect two ESP32s to each other，the STA cann't connect to AP.I have checked the ssid ,password,channel.