Error handling asp.net core API to Auth0 M2m Management API

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I am creating a security controller within my asp.net core API.  My Blazor Web app connects to the ASP.NET Core API and it communicates to the Auth0 Management API.  I have setup  Auth0 / asp.net core API to utilize M2M.

Everything works as expected (i.e. tokens, rights, etc) BUT for some reason I am not able to catch the status code from Auth0 (i.e. Auth0 is not throwing the error as I would have expected.  Is there anotherWhen I pass a valid auth0id, I get the json response (perfect).  When I pass an invalid ID, I know that Autho throws a 404 error (The user does not exist).  I am wanting to capture Auth0 exception so that I can handle it using Status Codes instead of description.   

The exception handler I have been able to find is ErrorApiException.  If this is not the correct one, what should I be using?  Auth0 is throwing an expection because  I can able to handle viw catch (Exception ex) when (ex.Message == "The user does not exist.").
 

using Auth0.Core.Exceptions;
using Auth0.ManagementApi; (version I am using is 10.0.0)

...

 public class SecurityController (IManagementApiClient managementApiClient, ILogger<ItemsController> logger): ControllerBase
{
     private readonly IManagementApiClient _managementApiClient =                managementApiClient;
....

[HttpGet("User/{auth0id}")]
[Authorize(Policy = "Read:Security_Tables")]

public async Task<ActionResult<UserModel>> GetUser(string auth0id)
        {

            _logger.LogInformation("{UserId} - Get: api/Security/User/{auth0id}", User.FindFirst(ClaimTypes.NameIdentifier)!.Value, auth0id);

            try
            {

                GetUserResponseContent result = await _managementApiClient.Users.GetAsync(
                                           id: auth0id, request: new GetUserRequestParameters
                                           {
                                               IncludeFields = true
                                           });


                UserModel user = new UserModel
                {

                    User_Id = result.UserId,
                    Email = result.Email!,
                    Email_Verified = (result.EmailVerified == true ? true : false),
                    Username = result.Username,
                    Phone_Number = result.PhoneNumber,
                    Name = result.Name!,
                    Nickname = result.Nickname,
                    Given_Name = result.GivenName!,
                    Family_Name = result.FamilyName!,
                    Blocked = (result.Blocked == true ? true : false)

                };


                return Ok(user);
            }

            catch (ErrorApiException ex)
            {
                System.Net.HttpStatusCode statusCode = ex.StatusCode;
                return NotFound(ex.Message);
            }
            catch (Exception ex) when (ex.Message == "The user does not exist.")
            {
                return NotFound(ex.Message);
            }
            catch (Exception ex)
            {
                return BadRequest();
            }



        }

Thanks everyone