Chaos Studio’s Azure Active Directory (AAD) Outage template allows you to induce an outage on your AAD instance by modifying your network security group rules (NSG Security Rule (version 1.1)) fault. 

Chaos Studio’s Availability Zone Down template allows you to take down specific (or all) availability zones within your VMSS instance (with autoscale disabled). This template utilizes both the “Disable Autoscale” and “VMSS Shutdown (version 2.0)” faults to perform the outage scenario.  

You may choose to utilize the experiment templates as is (by just adding target resources to the pre-filled faults) or you can further customize either scenario (in Chaos Studio’s Experiment designer). 

Learn more:

Use a chaos experiment template to induce an outage on an Azure Active Directory instance | Microsoft Learn

Use an Azure Chaos Studio experiment template to take down Virtual Machine Scale Set availability zones with autoscale disabled | Microsoft Learn