Notifications vary depending on the type of operation.
New Addition
If the invitation email delivery setting is set to "Enabled", newly added users will receive an email containing their Login information.
The default setting is "Enabled".
Related: Changing the Send Invitation E-Mail setting for users added via Provisioning
https://teachme.jp/8/manuals/51167397
Update
No notification will be sent.
Deletion
No notification will be sent.
Related: User Provisioning with Entra ID (Web Browser)
https://teachme.jp/8/manuals/51167437