Technical requirements
To be able to use Microsoft 365 Purview Insider risk management, you must have one of the Microsoft 365 E5, A5, F5, or G5 subscriptions. Alternatively, Microsoft 365 E3, A3, F3, and G3 subscriptions will work too, together with either compliance or insider risk management add-ons.
Ultimately, an Office 365 E3 subscription paired with Enterprise Mobility and Security E3 paired with a compliance add-on will provide you with sufficient rights to work with Insider Risk Management.