The LASO code is different from the Yanumas but hate to be the barer of bad news most likely the code has been discontinued meaning it won't work anymore however i can not confirm this. I would check your service record and make sure all the levels registered and then post in the waypoint section as you have said. But this may be the same issue plaguing the raider dstt helmet for those who have not obtained it as well where neither of the codes work even though requirements have been met..
Pretty odd for this to happen, because around 17th December 2018 I put in the Flying Colors code which gave me the Determined Stance, DMR skin, Emblem + 2 extra armors, I remember someone having a issue with the Radier DSTT helmet not registering 1000 war games completedActually i put the Yanumas code recently (forgot to put it in the far 2014) and it worked. It seems that only statistics-related codes doesn't work because, like you said, there are few players that have issues with that Raider DSTT Helmet and few others with the LASO Code (like me). That should be only a bug, because Halo Waypoint still tracks all the stats of the game (at least for Halo 4). Just the codes don't consider these stats. I will try to post this issue in the Halo Waypoint section of the forum
Thank you for the reply
I understand what you wrote and, in fact, i'm waiting for a fix or, at worst, a confirmation of those 'main servers shut-down', since until any 'engineer' says it we are just doing
I posted this issue also in the Halo Waypoint section of the forum, hoping this problem get the right visibility.