Note: The simplified pinout diagram indicates that D0/D1 are swapped relative to all other Nano 33 boards, though still maintaining their RX/TX allocations. This, however, does not match the silkscreen pictured on the board itself at https://store.arduino.cc/collections/nano-family/products/nano-33-ble-sense-rev2, therefore I am going to assume this is an error in the pinout diagram.
See: https://docs.arduino.cc/hardware/nano-33-ble-sense-rev2
Note: The simplified pinout diagram indicates that D0/D1 are swapped relative to all other Nano 33 boards, though still maintaining their RX/TX allocations. This, however, does not match the silkscreen pictured on the board itself at https://store.arduino.cc/collections/nano-family/products/nano-33-ble-sense-rev2, therefore I am going to assume this is an error in the pinout diagram.