Call of Duty Modern Warfare (2019) Achievement Liberation UNLOCKING SOLUTION FOUND

UPDATE 1/17/20 BOOM answer found I tried all the options one would try Hard resets waiting playing am additional one even though everyone insisted that you only need the OG 4 (crosswind, Palladin, Kurduva,head Hunter) I was desperate idk. But what it boils
down to is this.

IT WILL NOT UNLOCK IF YOU BEAT ONE THAT YOU JOINED ala a
IN A GAME THAT WAS IN SESSION. yes it will say you beat it, you will get the in game rewards and the XP but it will not count to the achievement.

Here is how I came to this, I am 90% of the time the host so i start the games. Well on one night I was invited in just as they started, we beat it I got the credit, went on to grind the other as me being the host over the next day or so obv no achievement.
I decided to redo the one i was invited into from the rip ( lobby) completed the mission and then the glorious pop. >>

**MORALE OF THE STORY THIS ONLY BE OBTAINED FROM STARTING FROM THE LOBBY WITH YOUR PARTY AT THE START POINT, JOINING A IN GAME SESSION WILL NOT GIVE YOU THE ACHIEVEMENT CREDIT..

Time for sleep whew I feel better, Cheers

:)