Went to reinstall destiny 1 after not having played for years and saw it listed in my games as "trial mode" despite my having bought the full game as well as all of the dlc.
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Trials mode is the demo. This happens when you don't have the game licences for the base game downloaded. If you have a digital copy... make sure the licence is downloaded. If you have problems contact your platform's support. If you bought it on disc.. make sure the disc is clean and undamaged. Also make sure your disc drive is working correctly.