Not at all.
If you unlocked them in the S17 season pass but didn't collect them in the 3-4 months and them in the 3-4 months of S18 through the website, than theres nothing can be done, it's your own fault.
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I didn't collect them because it never crossed my mind that this is how bungie handled things. I never expected to just NOT being given the things after season ends even though you paid for the stuff and reached the lvl because I didn't manually clicked on them. I also never expected to nor be able to go back and collect them at any later date. I guess it's my fault for expecting a functioning and logical system.
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This is how Destiny has worked since the beginning In D2 at the fractions, the loot that you didn't collect also disappears as an an example, you had 4-6 months for that, more than enough. I'm sorry, but it's your own fault.🤷