Hi,
in the README, you suggest to create an AD app with the following call:
az ad app create --display-name CloudRelayClient --password S0meHardT0GuessPassw0rd
The "--password" parameter is no longer supported, see https://docs.microsoft.com/en-us/cli/azure/microsoft-graph-migration
Now you can have a password created by doing the following...
az ad app create --display-name CloudRelayClient
az ad app credential reset --id <ID of just created app>