hello @Jovan,
the cc logic controllers between tinker board 2s and tinker board 3n are different -- for tinker board 3n, if both the ports connected are type c port, the controller will not be able to recognise which port should be in host mode and which port should be in device mode.
for tinker board 3n i would recommend to connect type c port from tinker board 3n to type a (macbook)