CrossfireX comes to Xbox consoles today, but the CrossfireX campaign that's meant to be in Xbox Game Pass is not yet appearing for subscribers. The campaign is split into two parts; Operation Catalyst, the first of those story modes, is the one destined for Game Pass, but since the game launched several hours ago, that campaign has been stuck behind a paywall.
The reason for this is unclear, but it's certainly unintentional. Operation Spectre is the second campaign that all players, including Game Pass subscribers, will need to buy as part of the game's Ultimate Package should they want to play through all story content, but Operation Catalyst is meant for Game Pass and just not showing up as of yet. The story was developed in partnership with Remedy, creator of Control and Alan Wake, so there has been some interest leading up to launch.
In the meantime, if you don't have Game Pass (or if you do but you're eager to play), you can gain access to Operation Catalyst for $10 ($9 for Game Pass subscribers), or as part of the game's Ultimate Package as well, alongside the premium Season 1 battle pass and second campaign. That complete package sells for $30 ($25 for Game Pass subscribers). For total clarity, here's how it's meant to all shake out once the storefront issues are resolved: