When coding Arduino projects for other people (and myself) I find having ASCII art pinouts of the hardware very helpful. It allows me to very quickly see the pin assignments and pins used. Please feel ...

At least the mapping for A0 is wrong in both the pinout diagram and the schematic. The pinout labels it as A0->AIN[0] The schematic labels it as A0->AIN[3] The NINA-B3 datasheets list it mapping to A0 ...