I purchased Lightfall about a week ago when it was 50% off but still don't have any access to the seasons.
Is this a bug?
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Can you head in-game to director->timeline on the top right and hover over the seasonal icons next Lightfall to see if any of them are marked as Owned? If none of them are - head to https://help.bungie.net/hc/en-us/articles/360049497351-Contact-Form-Missing-Eververse-Item-or-Add-On-Items and fill in the form linked at the bottom