Guest User Lifecycle Automation without Power Automate HTTP Action (Entra ID P1 + Microsoft 365 Business Standard)

Hi everyone,

I'm looking to automate our Guest User Lifecycle Management process using a PowerShell script with Microsoft Graph. The script identifies inactive guest users, pending invitations, generates reports, and can remove inactive guest users.

Our environment:

• Microsoft Entra ID P1
• Microsoft 365 Business Standard
• No Azure subscription
• No Power Automate Premium

I would like to automate this without relying on a user account or a user's workstation. Is running the script on a company server with a Microsoft Graph app registration the recommended approach, or is there a better Microsoft-supported solution under these licensing constraints?

Additionally, if the script performs guest user deletion using Microsoft Graph application permissions, does the app or service account require a specific Microsoft Entra administrative role (e.g., User Administrator or Privileged Authentication Administrator) to delete guest users?

Any recommendations or best practices would be greatly appreciated. Thank you!