You can access the start of the Labyrinths missions from either Entropy or CSEC.
You’ll need to complete a few contracts first. Accept and finish contracts as normal until you get the eOS contract. After finishing that, a new one will appear called “The Kaguya Trials”. Accept that to begin!
There will be a contract titled “The Kaguya Trials” available from CSEC from the start. Accept that to begin.
Those with a completed Hacknet save
Connect to CSEC. Abandon or complete your current contract if you have one, and accept the contract “The Kaguya Trials” to get started.