littek:
Thanks for the link!
Unbelievable there is no official PINout... fascinating
Not sure what you mean by "No official PINout"
Under Techincal Specs on https://store.arduino.cc/usa/arduino-mkrzero
There is a listing of the pins.
The female headers are labeled on the MKRZero which I have.
There are also the schematics located at: