Recently, Microsoft Forms were extended by adding new NPS type questions and here is the most basic way to use it with your clients.
So, firstly we need to add a special type of question
And then customize it if needed
Finally, this form could be shared and results could be reviewed on the Responses page
Now, there is an option to receive notifications to notify about any new feedback and there are some predefined templates in Flow, e.g. the one called “Notify me in Outlook when a student completes a quiz” and it will do exactly what we are looking for.