Edit: If you're having the same issue, check @supermansdoctor 's comment for the answer
So I was away on a camping trip for 3 days, and I come back to hear Outbreak Prime was re-added to the game while I was away. Naturally, I was hyped. I hopped on my PC and went to go start the mission with the adventure "Bad Neighbors" on Titan, only to realize that it wasn't there. In it's place was "Siren Song". I played through it in an effort to cycle it or something, restarted the game, changed characters, and nothing. So does this mean ill NEVER be able to get Outbreak Perfected because I was gone for 3 days?
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Yes you don't need to do the heroic mission you can just walk to the area in patrol. I have hear one of three things that may be required to get this though 1. You're playing with your original D2 character. Think this means the first guardian you started the campaign with. 2. You have done all the heroic missions on Titan before. Possibly why you're seeing Siren Song as you may not have done it heroic? 3. It's the Guardian you did Rat King with....... yeah this one sounds far fetched but just throwing it out there.