Hey Arda,
Did you redeem/purchase Rise of Iron on the account you're currently using? Unlike the level 25 Spark of Light, players cannot get the level 40 Spark of Light if they are game sharing.
If you are on the account that redeemed/purchased Rise of Iron, please try restoring your licenses. This article will explain how.
https://www.bungie.net/Mobi/en/About/Article?id=12181
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I am game sharing but was it pointed out?