When I am testing the POST Endpoint for Region, I found this issue.
I was checking the issue and it looks some problem in this section of code

`[HttpPost]
public async Task AddRegionAsync(Models.DTO.AddRegionRequest addRegionRequest)
{
// Request(DTO) to Domain model
var region = new Models.Domain.Region()
{
Code = addRegionRequest.Code,
Name = addRegionRequest.Name,
Area = addRegionRequest.Area,
Lat = addRegionRequest.Lat,
Long = addRegionRequest.Long,
Population = addRegionRequest.Population
};

        // Pass details to Repository
        region = await regionRepository.AddAsync(region);

        // Convert back to DTO
        var regionDTO = new Models.DTO.Region
        {
            Id = region.Id,
            Code = region.Code,
            Name = region.Name,
            Area = region.Area,
            Lat = region.Lat,
            Long = region.Long,
            Population = region.Population
        };

        return CreatedAtAction(nameof(GetRegionAsync), new { id = regionDTO.Id }, regionDTO);
    }`

System.InvalidOperationException: No route matches the supplied values.
at Microsoft.AspNetCore.Mvc.CreatedAtActionResult.OnFormatting(ActionContext context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ObjectResultExecutor.ExecuteAsyncCore(ActionContext context, ObjectResult result, Type objectType, Object value)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeNextResultFilterAsyncTFilter,TFilterAsync
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResultExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.ResultNext[TFilter,TFilterAsync](State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeResultFilters()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|20_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Swashbuckle.AspNetCore.SwaggerUI.SwaggerUIMiddleware.Invoke(HttpContext httpContext)
at Swashbuckle.AspNetCore.Swagger.SwaggerMiddleware.Invoke(HttpContext httpContext, ISwaggerProvider swaggerProvider)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddlewareImpl.Invoke(HttpContext context)

HEADERS

Accept: /
Connection: keep-alive
Host: localhost:7237
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Content-Type: application/json
Origin: https://localhost:7237
Referer: https://localhost:7237/swagger/index.html
Content-Length: 125
sec-ch-ua: "Google Chrome";v="111", "Not(A:Brand";v="8", "Chromium";v="111"
sec-ch-ua-mobile: ?0
sec-ch-ua-platform: "macOS"
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: cors
Sec-Fetch-Dest: empty

Can help me anyone with this?, please

System.ArgumentNullException
HResult=0x80004003
Message=Value cannot be null. (Parameter 's')
Source=System.Private.CoreLib
StackTrace:
at System.ArgumentNullException.Throw(String paramName)
at System.Text.Encoding.GetBytes(String s)
at Program.<>c__DisplayClass0_0.<

The System.ArgumentNullException occurs in the line mentioned below in Program.cs

builder.Services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
    .AddJwtBearer(options => options.TokenValidationParameters = new TokenValidationParameters
    {
        ValidateIssuer = true,
        ValidateAudience = true,
        ValidateLifetime = true,
        ValidateIssuerSigningKey = true,
        ValidIssuer = builder.Configuration["Jwt:Issuer"],
        ValidAudience = builder.Configuration["Jwt:Audience"],
        IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(builder.Configuration["Jwt:Key"]))
    });

Unable to execute insert query to the Walk table. Getting The INSERT statement conflicted with the FOREIGN KEY constraint "FK_Tb_Walks_Tb_Region_RegionId". The conflict occurred in database "NZRegionsDb", table. When i try to Add the walk data from the API swagger,Swagger also throwing same error.