I went to the pointy eared non giver of the assignment at Starfleet Academy, it gave the assignment in the title, the requirements of the assignment are to have a Photonic Studies Scientist, now i have 1 of them ellusive beasties hiding in my ship and the option to use her wont come up in the recomendations or anything, am i doing something wrong? - also i cant get anyone come up in show all roster.

I have the Doff
I have enough slots to have more assignments
I have never done the assignment before..ever so there is no cooldown

I just dont know whats wrong, does anyone know

Cultural exchanges do not require any DOffs to start, you merely tell it to get going...

Thanks for that, all sorted now, got a lil confused by it , my bad