weapon mastery not received. ea help says they can't give me the assignment.

After reaching lvl 10 with the sjögrun shotgun I didn't receive the mastery assignment and i checked all the things to do as per the FAQ. (also missing the urban blue sight skin so i'm guessing it's a lvl progress bug)

After I reached out to ea help where an advisor was able to grant me the previously completed masteries for the classes but not for the weapon so he told me to go play a round to see if it would update but it didn't.

I reached out later and the new advisor did the same and now the proficiencies for the classes also reappeared. I was quite addement and shared screenshots that I particularly meant this weapon but even after asking his senior colleagues and the team he said they dont grant weapon rewards as it is an ingame process.

I fail to understand how the ingame process for the class masteries/proficiencies is any different from the weapon onces and am wondering if anyone knows what to do if ea help is also insufficient.