I can play AVALON mission and earn Vexacalibur, however when I go to craft it I get the message "Destiny 2: Lightfall Required"
Note I own Season 20-23 on my account but do not own Lightfall.
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Hi there. Season passes and DLCs are separate licenses. As the message indicates, you need to get the Lightfall DLC if you want to make the craftable version of Vexcalibur.