A Logic App that notifies Pull Request reviewers?
First create an Azure Logic App with the following code:
Copy the URL. And go to go to Azure DevOps Project settings -> Service hooks -> Create new subscription -> Webhook
Enter the URL. Press test and finish.
Study the json content on the run history of the development tools of the Logic app.
The logic app should look like this. You can run the logic app on Run History.
Done, you have a Logic App that notifies reviewers of the Pull Request.