How do you access Mission 46?

In Metal Gear Solid 5: The Phantom Pain, I know the ending mission is 46. How do you unlock the mission so you can play it and watch the ending?
Edit 1:
I got that ending but it still will not unlock for me. I got the cassette tape at the end and all.
Edit 2:
Here are the screenshots (MAJOR SPOILERS): steamcommunity.com/sharedfiles/filedetails/?id=519951201 and steamcommunity.com/sharedfiles/filedetails/?id=519951450 (Spoiler tags enabled for each)
Best Answer
To unlock Mission 46 "Truth: The Man Who Sold the World ", Phantom Pain's true final mission you need to meet certain requirements.
- Complete missions 1-31
- Complete postgame Story Missions
Mission 32 To Know Too Much
Mission 38 Extraordinary
Mission 41 Proxy War Without End
Mission 43 Shining Lights, Even In Death
- Complete postgame Side Ops Story Missions
Side Op - Extract the AI Pod
Side Op - Secure the Remains of the Man on Fire
Side Op - Search for the Escaped Children 1
Side Op - Search for the Escaped Children 2
Side Op - Search for the Escaped Children 3
Side Op - Search for the Escaped Children 4
Side Op - Search for the Escaped Children 5
- Listen to all story audio/cassette recordings (they are yellow in colour)
- Upgrade entire base, and platform to level 3 or higher.
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Quick Answer about "How do you access Mission 46?"
How do you unlock Chapter 2 in Metal Gear Solid 5?
CHAPTER 2: RACEThe Chapter 2 missions unlock gradually after completing Mission 31 of the Main Story. Chapter 2 contains 19 extra missions, seven of which are brand new (the rest are just repeats of previous missions but with higher difficulty).How do you unlock true ending MGSV?
To reach Episode 45 (Quiet's Ending) or Episode 46 (True Ending) you'll need to complete these optional and required missions. Optional missions are denoted with a white circle while important required missions have a yellow circle. To get this mission, you must complete Episode 43 \u2013 Shining Lights, Even in Death.How do you unlock the shining lights even in death?
To trigger this mission, Snake must complete THREE missions/Side Ops after the hijacking of Sahelanthropus from Mother Base. After the third mission is complete, Miller will call Snake and inform him of a new outbreak, which triggers a one-time-only cutscene of Snake deciding to handle the problem himself.How do you unlock Mission 45 and 46 MGSV?
Enter and complete Side Op 150, and Mission 45 will begin immediately at the end of that. Complete Mission 45, and you can now begin the process of unlocking mission 46. Now Mission 46 will take a ton of work, but don't lose sight of your goal. You must complete every single campaign mission in the game (1-45, 47-50).Metal Gear Solid 5 Phantom Pain- How to unlock mission 46
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Answer 2
I just want to leave here my experience.
I had done mission 45 and side ops 150.
I did a lot of side ops but mission 46 wouldnt pop.
What I did was trigger all my tapes which were not heard and then did ONE side op.
Upon completion mission 46 immediately appeared in the list.
Mother Base had absolutely nothing to do with it.
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