Can't unlock the Thompson (M1928A1)

Product: Battlefield V
Platform:PC
Please specify your platform model. PC
AMD or Nvidia Model Number Geforce GTX 2070
Enter RAM memory size in GB 16
Which part of the game is the issue happening in? Multiplayer
Which part of the mode? Conquest
Please select your region North America
On which server did this happen?
When did this happen? (dd.mm.yy hh:mm) 6/29/2019
Summarize your bug I reached Medic Rank 20 today and for some reason, the gun will not unlock for me which is a major disappointment. Just says "Rewarded at Medic Rank 20" which I am at rank 20 so I'm not sure what else I need to do to unlock it.
How often does the bug occur? Every time (100%)
Steps: How can we find the bug ourselves? Reach medic rank 20 idk
What happens when the bug occurs? Can't unlock the final medic rank gun.
What should be happening instead? Unlocking the final medic rank gun.

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I reached Medic Rank 20 today and for some reason, the gun will not unlock for me which is a major disappointment.

Just says "Rewarded at Medic Rank 20" which I am at rank 20 so I'm not sure what else I need to do to unlock it.