Using Blazor, AD B2C and API Manager

Question

Hi,

I am using Azure AD B2C to secure my Blazor app and API’s.

I have APIM fronting a set of Azure Fuctions.

I can authenticate the user ok, using the MsalAuthentication class (well, the builder.Services.AddMsalAuthentication method). As it pointed out in the docs, hereadditional-scenarios, with a few tweeks as the Applications base address is different from the API base address.

The issue I have is described here and the solution is that I need to be requesting an Access token from Azure when I authenticate – I think. My big issue, is I don’t know how to configure either the Azure B2C Aplication, or the Msal classes in the Blazor app to request the Access token. Using IE Web Dev Tools, I can see I am only getting an ID Token once authenticated.

Thanks for any help you have.

Graham

Answer 1

Hi @JamesTran-MSFT , thanks for getting in touch.

I have solved the issue now. My problem was due the scope I was requesting when authenticating. For some reason, in the Program.cs file, when configuring the Msal Authentication provider. When I included the Default scope for my Server API, I managed to get the scope name wrong (the one that needs to be qualified with the AD organisation).

Once I corrected this, I was able to get the correct token returned and it's all working now.

Thanks.

Answer 2

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