Occasionally we receive support cases from customers performing audits of their Azure AD Audit or Sign in logs and do not know what the service principal \ actor ” Microsoft Approval Management “ is.
After review with Microsoft product engineering teams it was confirmed this is a 1st Party Microsoft Service Principal for the following services and may be logged in customer audit logs during the operation of any of these services in your tenant.
Any of the operations performed by these services such as calculating group memberships, applying group memberships, performing group expirations etc. will be logged in Azure AD audit logs as being performed by “Microsoft Approval Management”. All of the operations performed by these services, are documented in the links above.
You can confirm this service principal is in your AAD tenant with the AzureADPreview PowerShell module and the following cmd
Get-AzureADServicePrincipal -Filter "DisplayName eq 'Microsoft Approval Management'" | fl *
Where you should confirm that the PublisherName = “Microsoft Services” and you may find it listed with the AppID of “65d91a3d-ab74-42e6-8a2f-0add61688c74” or “38049638-cc2c-4cde-abe4-4479d721ed44”