The nrf dongle has many stones on its hacking path.

• UICR.REGOUT has to be set to 3v3

Default to do so might brick it, and rescue needs high voltage jumpers switch explanation from Nordic here

• UICR.NFCPINS

Using the simplest pio, with my luck on falling over pio 0.10, of course it does not work, you need to set the UICR of NFCPINS PROTECT to disable.

• LEDS don't blink

although defined with the right functions LED1_G,... into pca10059.h, when using 

bsp_board_led_on() indexes from 0 to nb leds have to be passed and not the led defines !!!

• Ground mass

without a bigger ground mass, the cpu keeps getting hard faults, so when debugging with swd I had to connect a usb charger without powering it on, just for bigger ground mass.