I sent a recruitment code to my friend. im from ps4 he’s on pc. how do we submit the 8 digit code in mog?

he bought the european region hard copy for pc. he now made a european region mog station account. so is it still possible that i can get the golden feathers? im from us region mog and he is using european mog?

i need help asap before we submit the pc hard copy liscense to his mog ty.