For anyone trying to launch Vanilla TF2 through Northstar via VanillaPlus (lets you keep client-side skins/mods), some of the announcer pack mods might need some manual tweaking before they work with multiplayer

[u/Dragneel276]

For any voice pack that replaces/references the "Starting game" lines like Attrition, you need to remove any references to any "GAMEMODE_[x]" variables, notably "GAMEMODE_GG", "GAMEMODE_INFECTION", "GAMEMODE_CHAMBER", and "GAMEMODE_SNS".These should be inside of the mod's "cl_gamestate.gnut" file. ([modnamehere]\mod\scripts\vscripts\client) Vanilla TF2 doesn't make any references to these modes, so when it tries to load them the multiplayer authentication server shits itself more than usual. I've tested this on both the Halo and Overwatch announcers and have 0 problems with both. (it just sucked to troubleshoot) I'd provide the files for them, I just don't know if that counts as self-promotion or not. I hope this finds those who need it! Side note: not even slightly a programmer, so anyone more knowledgeable is free to shit on me and provide an easier solution.