Failing to load into mission

I started a fresh campaign but am unable to load into any mission except for the first one. Even when playing continuously from the first, I am booted back to the main menu after finishing “the winter contingency”. If I try to load into a mission directly from the menu, I see a loading screen, which then promptly dumps me back to the main menu. Is this common? Know of any fixes?

Please see the pinned thread regarding Halo Support and how to submit tickets for issues you may be experiencing.