There should be rest API to create Dynamic 365 Customer Voice Invitation. Currently its possible only using Power automate where it binds to a single user. In case a user left the organization, then the survey sending stops and another user needs to sing in with his/her credentials to make flow working. So, it should support some rest API to create Dynamic 365 Customer Voice Invitation so, that people can utilize server to server authentication and it does not depends on single user.