Thought i'd post this here given we are no longer in the preview window, whenever I request the MultiLevelMasterDetail feature in my scratch org definition file. Im greeted with
"ERROR running force:org:create: MultiLevelMasterDetail is not a valid Features value."
My Devhub is on Spring '20 Patch 10.4 and i'm running the latest version of sfdx on my mac.
Version: sfdx-cli/7.47.0-0e5d18732f darwin-x64 node-v10.15.3
{
"orgName": "Buy Ethereum",
"edition": "Enterprise",
"features":["MultiLevelMasterDetail"]
}