IoT Router Carrier Board Mini as WLAN access point

Hi,
 

I am using IoT Router Carrier Board Mini in combination with a Raspberry PI 4 with a WLAN module. In addtion I am using an EDUP AX3000 WiFi6 USB-C. 

In both cases I am able to use them as WiFi Client but not as WiFi access point. As OS I am using OpenWRT.

Was anybody able to setup IoT Router Carrier Board Mini as a WLAN access point? If yes, which WLAN chip, USB-C stick was used and what OS?
THX in advance for your help

Regards