I haven't found a proper solution to this, but as a workaround I'm now using Dev kits with 38 pins. Here, I can access 9 of the 10 pins without a problem...

Sorry for re-opening this old thread, but I found it while having the same error: It can also happen if you're trying to build in the wrong folder. In my case, I was calling idf.py build inside the component folder instead of its parent. Switching to the correct folder before building solves the iss...

Hi, I'm using a Node MCU DevKit and want to use 9 touch sensors. However, TOUCH2 (T2) does not work. I realize that T1 is not exposed on this board, but according to the datasheets (for example: https://joy-it.net/files/files/Produkte/SBC-NodeMCU-ESP32/SBC-NodeMCU-ESP32-Manual-2021-06-29.pdf) T2 sho...