How to resolve 401 Unauthorized Error for API calls from UWP application using MSAL token

Question

We have an UWP application for which we are using ADAL Authentication process . But we are migrating it to MSAL. We have followed the code implementation for our application as suggested in the below link

https://learn.microsoft.com/en-us/azure/active-directory/develop/msal-net-migration-public-client?tabs=interactive

Post our authentication , we are calling web APIs which are hosted in Azure APIM and the code development is handled in a different Project.

While calling the API , we are passing the token with "Authorization header through the HttpClient" object and in Response we are getting 401 "Unauthorized".

Answer 1

if the app is displaying the login dialog with no errors, then most likely you have not defined a scope for api access. you api registration needs a scope defined for access, and your login should include this scope.