Detect User/Group Membership Changes in SharePoint

Hi jaya krishna gonuguntla

Based on my research, the most suitable approach for your scenario is to use Audit log activities available in Microsoft Purview. This allows you to capture and review important events related to access and permissions. 

Through audit logs, you can track activities such as: 

+Users being added to or removed from a SharePoint site 

+SharePoint groups being added to or removed from a site 

+Users being added to or removed from SharePoint groups that have access to a site 

References: 

• https://learn.microsoft.com/en-us/purview/audit-log-activities#sharing-and-access-request-activities
• https://learn.microsoft.com/en-us/purview/audit-log-activities#site-permissions-activities
• https://learn.microsoft.com/en-us/purview/audit-search

For approaches that involve APIs, you may refer to the following Office 365 Management Activity API reference | Microsoft Learn. This includes audit data such as Audit.SharePoint 

I hope this provides additional insight. 

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