IDE hangs on startup: "teensy:teensy-discovery not found"

Development Tools IDE 2.x
2

At first run, the IDE needs internet access to download some additional stuff.

I'm not a Mac user.

  1. Does Jamf keeps a log? You can check that.
  2. Arduino IDE not working on macOS anymore - #2 by ptillisch contains instructions to get relevant data that might help others to help you.

I don't know enough about the subject so I will probably not be able to assist.