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Vault-Tec Calling
The story quest Vault-Tec Calling is a DLC quest that is part of the Vault-Tec Workshop Walkthrough.
Your only requirement to get this quest is to be at a Level 20 or higher. Once you've got that squared away, a radio signal from Vault 88 should be picked up the next time you are in the Commonwealth.
The newest vault is located in the south east portion of the map. Fast travel to the Suffolk County Charter School as it's the closest location to the vault. Follow your marker to the destination to find an abandoned construction site. Climb over some of the rocks and start dropping down to the lower levels, fighting off raiders as you climb down the steep stairs and head inside. On your right should be a dug out hole. Enter it to find the Vault 88 door.
Take out the two raiders near the activation panel, then snipe the remaining raider hanging around the vault door. With the room clear, activate the door and wait for it to open up.
Once the door opens up, Vault-Tec Calling will end and start the next mission, Better Living Underground.