Wyndhamm Power Outage: Technicians group doesn't exist

I have added the Wyndhamm Power Outage app from the App Catalog, then I need to add my user to the Technicians group but this group doesn't exist.

The Appian Community Edition is on a later version - 24.4 - and the exercise is based on 24.2 version. In Security Summary a warning is detected: "Missing administrator group. No basic users will be able to administer these objects, which includes editing their security or deleting them".

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