I have a very simple Azure function in C# for which I\'ve setup Azure AD Auth. I\'ve just used the Express settings to create an App registration in the Function configurati
In the AAD app itself, go to Settings -> Reply URLs and verify that the url of the Function App is in the list, which has the following format: https://mycoolapp.azurewebsites.net. If it isn't, then add it.
If you use slots, you have to add it for both slots.