You will get better response by posting in the ST_Anything thread: [RELEASE] ST_Anything v2.9 - Arduino/ESP8266/ESP32 to ST via ThingShield, Ethernet, or WiFi
With that said make sure the MAC address is entered exactly (in all CAPS), make sure you downloaded the child devices into your IDE that you are using, and beyond that make sure you go into configure the device like it should pop up a warning to do. I’ve found the “buttons” preference has to be set to 1, saved, then switched back to 0 and saved for it to work (or if you are using buttons whatever number you want). After that just give it a couple minutes.
I just added a second ESP32 running ST_Anything yesterday night so I know it works on the latest version of ST_Anything and of the SmartThings platform.