I finished the raid with my clan (for the 1st time ever) [u]after[/u] the maintenance yesterday. When I went to the tower there wasn't anyone to turn the milestone into....because the milestone was gone! As a new player(~293 BP) getting robbed of a luminous engram is brutal.
I've seen several posts from pre&post BNET release of people running into this.
https://www.reddit.com/r/destiny2/comments/7314op/anyone_else_not_get_the_milestone_for_finishing/
https://www.reddit.com/r/destiny2/comments/74rsrt/raid_milestone_disappeared/
https://www.gamefaqs.com/boards/207763-destiny-2/75793214
https://www.bungie.net/en/Forums/Post/231757656?sort=0&page=0
(Bungie response= https://www.bungie.net/en/Forums/Post/232435495?page=0&sort=0&showBanned=0&path=1)
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First off, congrats on your first raid completion! That being said, as has been stated many times before, the raid milestone works differently from most/all other milestones. The “powerful reward” referenced on it is whatever reward(s) you get throughout raid & the guaranteed item in chest after defeating Calus. You do not turn it in to a vendor at tower. It also is completed/removed from beating Calus.