Rajni Singh Thank you for posting your question in Microsoft Q&A. Currently, there is no notification specifically for user sign ups and only available for New Subscriptions
or Subscriptions Requests (requires approval)
for products etc. Refer Configure notifications in the portal for more info about the existing notifications. You can submit your feedback/idea via https://aka.ms/apimwish directly with our product team and others with similar interests can upvote it too.
However, you can integrate APIM with Event Grid, and send events such as Microsoft.ApiManagement.UserCreated
to an endpoint which can processes the data and send notifications to the users. Check out Send events from API Management to Event Grid doc and Azure API Management as an Event Grid source which describes about sending the events. The endpoint can be like Azure Logic Apps, Functions or any webhook endpoint.
I hope this helps with your question and let me know if any questions.
If you found the answer to your question helpful, please take a moment to mark it as "Yes" for others to benefit from your experience. Or simply add a comment tagging me and would be happy to answer your questions.