If ~/Library/Logs/Extensis/ folder is inaccessible, Suitcase Fusion and Universal Type Client is not able to add fonts to the font workgroup. It will create a matching folder name, but the fonts never appear. Universal Type Client will not generate an error or warning message.
This will occur on all compatible versions of Universal Type Client for macOS.
Fix the ownership and permissions on the ~/Library/Logs/Extensis/ folder. If you are unable to perform this process, please contact Apple or Extensis Support for more assistance.