You are not alone! I'm having this latency issue with COD as well. Whats weird is that 4 of my friends are using Maxis fibre as well but i'm the only one facing this issue!
This is my 2nd time having this issue.. the first time resolved itself after a week! On multiplayer or warzone, i would get the best about 90+ ms if i solo Q but when i join friends lobby or play with friends.. i would get 200ms every match! This is the issue im facing right now :-
1. Searching match at <108ms by default
2. Join my friends lobby (from MY & using Maxis as well) i'm with 200ms while my friends are 20ms+
3. If my friends join my lobby, they would get 150 - 200ms as well
4. My latency is fine with all other games (CSgo, apex, Dota2, Valorant)
5. Sometimes i would be in the same match with EU / US players.
Edit: i did some trace route to the COD address when i'm in a match and it is located at Japan when im on 90+ms.. So i assume that there's some route issue with maxis to the cod server and somehow it connected me to a different region? I also called Maxis and they told me there's no issue with their network.
This is strange, Warzone is unplayable right now. I'm always getting >=200ms ping on Warzone while my friends on the same lobby which are using Unifi are always getting consistent <=30ms. Multiplayer and Coop on the other hands are different, sometimes in between 90ms to 120ms when I'm lucky but most of the time around >=200ms and the players are definitely USA or EU which is weird since I have it launched on Asia. I am definitely not enjoying grinding the Battlepass like this for the past few weeks, very demotivating.
Also I called Maxis CS about this problem, same answer as in nothing's wrong on their end and that "around 100ms ping or latency is good bro".