My friend and I found out that you can share any level quest with other people we tested it out by sharing high level quests with our low level characters and what we also found out whilst leveling together is that if you have already done a quest the other person hasn't you can share it with them again.
but what also happened is the person receiving the shared quest was registered as having never done it by the npc and would have to get it themselves from the npc or was not able to pick up the next chain.
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