Recently released Macs that include an integrated T2 chip include new security features "Secure Boot" that control what startup disks can be used. These models include:
* iMac Pro
* Mac mini (2018)
* MacBook Air (2018 and later)
* MacBook Pro (2018 and later)
* Mac Pro (2019)
In order to use the Basic and Minimal Profiles and eDrives created with Techtool Pro 11 and later with macOS 10.14 Mojave, you will need to start up to your Mac's Recovery HD and change some settings in the Startup Security Utility.
An example of the Startup Security Utility interface is below.