Azure AD B2C updating users sign in names results in error

Question

When I'm trying to update the list of SignInNames , I get the error: Resource <EMAIL ADDRESS> does not exist or one of its queried reference-property objects are not present .

var currentUser = await GetUserByUserNameAsync(userId); // this gets the user
var signinNames = currentUser.SignInNames.ToList();
signinNames.Add(new SignInName
{
   Type = "emailAddress",
   Value = newEmailaddress
});
var data = new B2CChangeEmailAddressData()
{
    SignInNames = signinNames
};
var response = await _graphApi.SendAsync(new HttpMethod("PATCH"), $"users/{userId}", null, data);

And then it returns the error. I use comparable code to update the password, that works fine. Am I overlooking something?

Answer 1

So, what I did was:

• I got the user by its sign in name (the email address)
• I tried to edit the user by using the sign in name

The first is possible, but the second isn't. I had to update the user by using the ObjectId . So the code should be:

var currentUser = await GetUserByUserNameAsync(userId);
var path = $"users/{currentUser.ObjectId}";
var signinNames = new List<SignInName>();
signinNames.Add(new SignInName
{
     Type = "emailAddress",
     Value = newEmailaddress
});
var data = new B2CChangeEmailAddressData()
{
     SignInNames = signinNames
};

var response = await _graphApi.SendAsync(new HttpMethod("PATCH"), path, null, data);