Well I have hooked up the second mmwave sensor and that one worked fine. Also now with the connection to GPIO6 and GPIO5 the sensor start sending data as soon as the esp board get powerd.
My first mmwave sensor seems to be broken. Also the first XIAO board (both purchased directly form SeeedStudio). There seems to be a shortage on the first XIAO board between the 3.3V and ground.
I changed one thing in the yaml code (not sure if it makes any difference) and that is the board.
esp32:
board: seeed_xiao_esp32c3
variant: esp32c3
framework:
type: esp-idf