Authorization Rules in Azure App Service is not working
According to your description, I followed URL Authorization Rules and created the authorization.json in my Visual Studio. I could make it work as expected on my Azure Web App.
https://bruce-chen-001.azurewebsites.net/
https://bruce-chen-001.azurewebsites.net/admin/admin.html
I assumed that there be something wrong with your authorization.json file. I found a similar issue about Encountered unexpected character ‘ï’ error serializing JSON, you could refer to it.
Updated
Here is my authorization.json file:
Please make sure you have chosen Allow Anonymous requests (no action) under the “Action to take when request is not authenticated” in the Authentication/Authorization blade of your App Service on Azure Portal.
