I use the Si-DBG1015A Simplicity Link debugger, and I had the following connections to the XIAO expansion board:
Board SWCLK to SWCLK/C2CK debugger
Board SWDIO to SWDIO/C2D debugger
Board 3V3 to VTARGET debugger
Board GND to GND debugger
Board RESET to RST debugger
XIAO MG24 powered via USB-C
Programming was possible once without errors, but then the XIAO expansion board failed.
Afterward, I soldered the debugger cables to the XIAO MG24 in the same order. Programming is now possible without problems. The XIAO expansion board has a short circuit on the 3V3 line coming from the XIAO. This is the reason why the XIAO is getting hot. I can’t think of any reason why the board failed.
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