I have found many skulls in halo combat evolved but can not use them in game…is this a glitch our is, this how it’s supposed to be
Some of those skulls are preorder bonuses. Every skull, with the exception of Halo 2’s Feather skull, will become available on December 12, 2014. Hope this helps!
skulls are still not available to use 
I can use all of them now. even the one that were a preorder bonus. no idea what happened but it just… happened.
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> I can use all of them now. even the one that were a preorder bonus. no idea what happened but it just… happened.
They were supposed to be unlocked on the 12th of December, one month after the release of the MCC ! 
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> skulls are still not available to use 
Have you hard reset your Xbox One, just in case ? It will maybe work with that. If not, just ask for help to Xbox Support on Twitter.
They’re all available on my game… I’m just waiting for some of them (Envy, Swarm, or even Bandana and/or Scarab) to be added into H2A’s LASO Playlist.