How to specify authority to MSAL?

[grenzi]

I'm relatively new to this so please excuse my ignorance. I've been trying to figure out how to give a custom authority to the Uno.Extensions.Authentication.MSAL

I've tried throwing various strings like B2CAuthority, Authority, etc, into the appsettings.json.

I've tried this in the builder. If i leave in the appsettings, things work but it appears to not use the authority. if i remove appsettings, i get a error regarding the null client id. Thus, it appears to ignore this regardless.

var builder = this.CreateBuilder(args)
                    ....(omitted)...
                    .UseAuthentication(authBuilder => authBuilder.AddMsal(builder => PublicClientApplicationBuilder
                        .Create("GUID")
                        .WithB2CAuthority("https://TENANTNAME..b2clogin.com/tfp/TENANTNAME.onmicrosoft.com/B2C_1_susi")
                        .WithRedirectUri("msalGUID://auth")
                        .WithClientId("GUID")                        
                        .WithUnoHelpers()
                        )
                    )

I imagine I'm missing something obvious, but the builder lambdas are relatively new to me.

How can I specify the authority for authentication to use?

thanks!

[grenzi]

Ok. I figured it out. You have to add exactly one scope to the "MsalAuthentication" section of appsettings (at least for my case, using Azure B2C, I get an error otherwise).

In case anyone else comes here looking for the solution, here's what i ended up using in app.cs:

.UseAuthentication(auth =>
    auth.AddMsal(configure => 
        configure.Builder(pcabuilder => pcabuilder
            .WithB2CAuthority("https://TENANTNAME.b2clogin.com/tfp/TENANTNAME.onmicrosoft.com/POLICY")
            .WithClientId("GUID")
#if __WASM__
                    .WithRedirectUri("https://localhost:5000/authentication-callback")
#elif __IOS__ || __MACOS__
                    .WithIosKeychainSecurityGroup("")
#elif __ANDROID__
                    .WithRedirectUri("msalGUID://auth")
#else
                    .WithRedirectUri("https://TENANTNAME.b2clogin.com/oauth2/nativeclient")
            #endif
            
        ),
        name: "MsalAuthentication"
    )
)