Dear @Sunny,
Thank you for posting your question in the Microsoft Q&A forum.
Based on your description, you wonder there is any built‑in SharePoint feature or Power Automate trigger that can notify when Members or Owners are added, removed, or when site permissions change.
Unfortunately, SharePoint Online does not offer a built‑in feature or Power Automate trigger that sends real‑time notifications when Members or Owners are added, removed, or when site permissions change.
However, the following supported alternatives are available:
Microsoft 365 Unified Audit Log SharePoint permission and membership changes are recorded in the audit logs (who made the change, what was changed, and when). These logs can be reviewed in the Microsoft Purview compliance portal, but they do not generate automatic email notifications. Access request emails: If users request access via the Share button, SharePoint can notify site Owners for approval. This does not cover direct permission changes made by admins and cannot notify a specific manager by default.
So, if this functionality is important to your organization, I kindly recommend you can submit feedback via the Microsoft Feedback Portal - feedbackportal.microsoft.com The product team is in charge of the site, and they constantly check customer reviews and feedback. The higher votes, the more attention the related team will pay on. And a lot of the features are developed and improved based on customer feedback.
I hope information above helpful, if you have any other questions, please feel free to reach out.
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