@Daniel Araneda Thank you for reaching out to us, as per the error message seems this is a license issue, review the license requirements to use this feature as mentioned here - https://learn.microsoft.com/en-us/defender-office-365/attack-simulation-training-simulations
https://www.youtube.com/watch?v=pR6oGrTGI3c
Let me know if you have any questions, feel free to post back.