XDM needs a valid XDM version 3 license key to run.

The license key must be stored in a file called license.txt inside the XDM core configuration directory. The path to this directory is specified in the docker-compose.yml file. By default, XDM uses the directory xdm-config.

Create a new file license.txt in the xdm-config directory, then copy the contents of the license key into this file. This license key is provided by UBS Hainer GmbH.