everyone who plays assassinations or any other customs games are having the same problem if you try to load a map or games type it comes up as blam and is unplayable 343 needs to fix this man
I either assume you’re trying to use a modded map that doesn’t work or the map/gametype name is being filtered. Halo Reach has a built-in filter that’s run by MS and as for modded maps I believe Reach does still detect for modded content and removes it/makes it unplayable.