The "[UnusualActivity] Full Deny Assignment" is a security measure implemented by Microsoft to protect Azure subscriptions from potential misuse or policy violations. This assignment restricts certain actions, even if you possess roles like Owner or Contributor.

This indicates that a deny assignment, specifically named "[UnusualActivity] Full Deny Assignment", is blocking your access. Such assignments are automatically applied when Microsoft's monitoring systems detect activities that deviate from typical usage patterns or violate certain policies.