Bungie doesn't offer any support for that, they only support one season/Episode back.
Side thing, did your account actually own the passes or did you get them via the free event? Once the event ended the free passes were revoked and the website/API still has the checks in place for people to make sure that they aren't trying to claim things they don't have the entitlements for.
Would've checked on crimson.report but your account is private.
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no i owned the actual season passes when they were out, my titan has the armor sets for the seasons surrounding season of the witch, and i've double checked my warlock actually does have the full set so both warlock and hunter have the set but my titan does not and can't claim it
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Can you check in-game by going to portal -> world -> timeline (top right) -> hover over the Season of the Witch icon next to Lightfall. It'll say whether its owned at the bottom (or nothing if it isn't), if it doesn't say owned then there's your answer. With the above said, given its beyond the one season limit Bungie set for them officially supporting, there's not really much here will come out of it and will likely want to directly contact the Wayback Machine either via Github or their Reddit account to see if they are able to provide any workarounds through the extension.