Re: Why will my Weapon, Vehicle, Attachment or Specialist not unlock?

Thanks all for the reports. 

Just as a heads-up, I also would like to point out this:

AWARE 11/16 @ 12:34 PM UTC - Challenge progression and reward unlocks continue to show an incomplete progression bar until the game has been restarted*

• FIXED - Restarting the game will fix this for you, however, a fix has been made for an upcoming update.

From https://answers.ea.com/t5/Updates/Battlefield-2042-Known-Issues/td-p/10944776.