Graph API throw error when trying to create an user

Question

Error - {The expression cannot be evaluated. A common cause of this error is attempting to pass a lambda into a delegate.}

Here is code I am using

        var requestBody = new User

        {

            AccountEnabled = true,

            DisplayName = "Display Name",

            GivenName = "Display",

            Mail = "cccccccccc@gmail.com",

            Surname = "Name",

            UserPrincipalName = "cccccccccc@gmail.com"

        };

        var result = await _appClient.Users.PostAsync(requestBody);
```I followed the tutorial here ([https://learn.microsoft.com/en-us/graph/tutorials/dotnet-app-only?tabs=aad](https://learn.microsoft.com/en-us/graph/tutorials/dotnet-app-only?tabs=aad)) and ([https://learn.microsoft.com/en-us/graph/api/user-post-users?view=graph-rest-1.0&tabs=csharp](https://learn.microsoft.com/en-us/graph/api/user-post-users?view=graph-rest-1.0&tabs=csharp)) Everything works but when I add my custom code as above, it fails with error.

 **{The expression cannot be evaluated.  A common cause of this error is attempting to pass a lambda into a delegate.}**

Answer 1

You cannot use consumer ID values for the UserPrincipalName property. It needs to match a domain within your Entra tenant, i.e. ccccccccc@tenant.onmicrosoft.com

Answer 2

It does not work. Even after removing the UserPrincipalName it fails.