Hi, I found a solution halfway writing a "help me" post and found the solution and wanted to share with others.
I get the following error when I attempt to Load & Activate a Model Target Database when the ModelTarget exists in the Scene.
"Failed to load data set X"
Vuforia ver. 7.0.50:5820766827909c23eee800256cda9ba0 (from Assets/Vuforia/version file)
MTG Ver. 7.5.20
Using Developer license key
The prefab that the xml from the MTG's unity assetpackage creates on import is empty!
Download and create ModelTarget using Vuforia's Legacy MTG Ver. 7.2.24