Symptoms
It is not possible to disable notifications for Send link for invite user notifications template. It is getting sent to all newly created service users, including those that were created by Office 365 synchronization from Microsoft Online Portal.
Cause
The functionality to tune recipients of the Send link for invite user notification. The feature request to implement it is known as POA-107510.
Resolution
Contact your TAM/PTA to trace the status of the feature request.