Matchmaking issue UK - Searching for Spartans

About a month ago i began to have issues when matchmaking alone, it would say searching for spartans for a long time (around 10 minutes) or it would not find any players and tell me to try a different playlist, i tried all of them! i thought this was possibly rank related but when the january season started i had the same issue when unranked, i have no problem finding a game when i search with other players. Also i can find games if i search when playing on a different gamer tag, i made a new account to test this and have played 50 games alone with no matchmaking issue. There is no connection isssue as my NAT is open, No issue with my digital game as i can play on a different gamertag, no problem with my xbox as i can play on a different gamertag. This leaves me thinking there is an issue with my profile, i have tried removing and reinstalling my profile, cleared local saved games. I am SR81 and do not wish to start all over again, please help!

sounds similar to me, I cant ever get a warzone assault or a BTB (others are fine!)

Did you find a fix for this in the end? I have the same issue when searching alone, but if there’s 2 or more people in the party, it finds a game straight away