Notifications vary depending on the operation performed.
New Addition
If the invitation email delivery setting is "Enabled", newly added users will receive an email containing their login information.
The default setting is "Enabled".
Related: Change settings for sending email invitations to users added through provisioning
https://teachme.jp/8/manuals/23718284
Update
No notification is sent.
Deletion
No notification is sent.
Related: Configure user provisioning with Entra ID (formerly Azure AD) (Web Browser)
https://teachme.jp/8/manuals/14985766