This may be a simple fix, try observing the tower on the destination map. Is there a blue symbol indicating a mission called "Advent" at the center top? Click on that and it should progress the introductory mission for you.
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[quote]This may be a simple fix, try observing the tower on the destination map. Is there a blue symbol indicating a mission called "Advent" at the center top? Click on that and it should progress the introductory mission for you.[/quote] No blue mission advent. I completed this along time ago. On multiple gaurdians