Still can't equip SS26

Despite today's update, it's still impossible to equip the SS26 in the Assault class even after completing the challenge. I've tried everything on PS5, changing the skin, setting it as the first gadget, finishing a match, unequipping all other weapons, switching the Assault class itself, literally everything that could be done, I did it. Still can't equip the shotgun, which means I can't progress in the Assault class or complete the 500 damage objective with the incendiary shotgun. It's been over 20 days now, and it's getting really tiring and frustrating to just wait and wait without anything being fixed. If anyone has found a way to solve this, I'm all ears,  I’ve tried every method I could find, but maybe I missed one. Thanks