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[guobinC]

After set breakpoint to
notification.Response.Redirect("/Home/Error?message=" + notification.Exception.Message);

the detail error message is:

Unable to get authorization code Could not load file or assembly 'Microsoft.Identity.Client, Version=4.37.0.0, Culture=neutral, PublicKeyToken=0a613f4dd989e8ae' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040).

[Turbo549]

I issued pull request #119 to address this and to fix a problem that was occurring when your B2C policy names use mixed case and TasksController.AcquireTokenForScopes() calls were failing to silently acquire a token to access the sample API.

[hercul1017]

I had the same problem and adding "/tfp" to AadInstance parameter in web.config fixed it.

<add key="ida:AadInstance" value="https://parrotexamcom.b2clogin.com/tfp/{0}/{1}" />

I could login, however api call fails now.

Account always null, GetAccountAsync could not find any account in AcquireTokenForScopes method.

var account = await cca.GetAccountAsync(ClaimsPrincipal.Current.GetB2CMsalAccountIdentifier());

My user flows are named by using capital letters like B2C_1_SIGNUP_SIGNIN. Thanks to @Turbo549, by changing web.config values to lower case like b2c_1_signup_signin fixed the issue. Now the sample apps are working for me.

[ganeshan]

I can confirm that changing from B2C_1_SignupAndSignIn to b2c_1_signupandsignin in
<add key="ida:SignUpSignInPolicyId" value="b2c_1_signupandsignin" /> fixed the problem calling API. The whole sample works as expected.