So my friend and I both have 45 calcified fragments. We turned in the 50 hadium flakes as well as doing the Undying mind part of the quest chain, then all of a sudden our quest chain is just dead.
Edit: So I honestly forgot I had even made this post, but for anyone out there who still has this issue I can tell you that the solution for me was that it was telling me I had the correct amount of fragments(45), but it was including all characters so I had to go back and use a Youtube video to go through all the fragments on 1 character to actually reach the 45 number on that 1 character.
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******READ THIS NOW******** the last step is glitched, It's officiall don't listen to the people saying you dont have 45 fragments on one character. This happened to my freind he had 45 fragments, didn't pick one up on any other character. he still didn't get the phobos mission... Here me out though, after 2 fustraiting days of waiting he deciding to do a random vanguard quest and this somehow activated the next quest. Strange right? Now try this and tell me if this solves the problem. OP edit this into the your post to make sure every one sees this ASAP