REASON & SOLUTION
For running the workflow in debug mode , when connected to Orchestrator , the Robot should be provisioned with type Development.
Thus you cannot start a job in ‘debug’ mode for a non-development robot.
You can gather more information on this by following below links:-
Please find the below snapshot for your reference.
Since Version 2018.1 the licensing is taken care by Orchestrator that means you do not need to individually license your studio/robots.
The licensing information will be fetched from Orchestrator and user will be able to run only those functionalities which are permitted by that type while provisioning the bot.
In case you do not see any available robots for development type please connect with sales team with your details and they will generate the new license code for you.