As people have said, you'll get the chance to do this mission again when the timer expires. These limited-time missions are given to ALL players when they are first added to the game. After the timer expires, the mission becomes "archived" and certain conditions are added as mission eligibility requirements. If you don't meet these requirements, the mission is removed from your mission list until you meet those requirements. The requirements could be anything - be above a certain level, kill a certain number of players, kill a certain number of NPCs, have a certain amount of attack, and so on. At your level though, you probably won't see the mission again for several
months. Just keep playing the game and levelling. You'll see the mission again when you meet those requirements, don't worry.
Oh, and any completions you make towards the mission
will still count after the timer expires, so you really don't have to worry about completing before the timer runs out. Just do what you can towards it (Because the mission has a really good xp-energy ratio so doing it will let you level faster. And if you use a Neural Interface artifact whilst completing the mission, it has an even better xp return), and when the timer runs out just go back to doing the other missions.
If you ever want any more information about ANYTHING in the game, check out the
Galaxy Legion Wiki. There's a search box at the bottom of the page. Just scroll down to it and type in whatever you want info for. You can type in the name of a mission, the name of a ship module, an NPC, a planet type, anything at all. The wiki is a community-created encyclopaedia of game information and new info is constantly being added. I've made several contributions myself.

If it helps, the wiki page for the Mylarai Embargo mission is available
Here.
_________________"Anyone without a sense of humour is truly at the mercy of the rest of us."
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