User Name and Email association in B2C

Question

We are creating users using Azure AD B2C. It uses User Name signin instead of Email. Users are able to log in once they are registered. But when I am using forgot password flow it gives following error.

I searched and found I can use EmailAuthenticationMethod to achieve this. I am using below mentioned code and getting "Exception of type 'Microsoft.Graph.Beta.Models.ODataErrors.ODataError' was thrown." error

public static async Task Main(string[] args)  
        {  
            try  
            {  
                var scopes = new[] { "Directory.AccessAsUser.All", "UserAuthenticationMethod.ReadWrite.All" };  
  
                // Multi-tenant apps can use "common",  
                // single-tenant apps must use the tenant ID from the Azure portal  
                var tenantId = "23*******-*******";  
  
                // Value from app registration";  
                var clientId = "57*******";  
  
                // using Azure.Identity;  
                var options = new TokenCredentialOptions  
                {  
                    AuthorityHost = AzureAuthorityHosts.AzurePublicCloud  
                };  
  
                var userName = "app@*********.com";  
                var password = "*********";  
  
                // https://learn.microsoft.com/dotnet/api/azure.identity.usernamepasswordcredential  
                var userNamePasswordCredential = new UsernamePasswordCredential(  
                    userName, password, tenantId, clientId, options);  
                  
                var graphClient = new Microsoft.Graph.Beta.GraphServiceClient(userNamePasswordCredential, scopes);  
                  
                await graphClient.Users["20*********"]  
                    .Authentication.EmailMethods["3d*****"]                      
                    .PatchAsync(new Microsoft.Graph.Beta.Models.EmailAuthenticationMethod  
                    {  
                        EmailAddress = "email@domain.com"                          
                    });                  
            }  
            catch (Exception ex)  
            {  
  
            }  
        }  

Answer 1

Resolved it by using PostAsync instead of PatchAsync.