Brand new MacBook Pro 2017 with the latest Parallels trying to use the built-in functionality to create a Mac VM and it fails. See images...
Hi @AntoineD1 , please download the app file for Mac Os High Sierra and try to install it as a guest OS and check if that works.
Stellar support. For something as simple (which I resolved) taking only a sentence to go the extra mile and provide great service, you chose mediocrity. Ho ho ho! To you too. tellar