Authorize with specific JWT scheme and [Authorize(...)] attribute

Describe the bug
I've added an MCP server to my API server. I need it to work with specific JWT tokens, configured differently from JWT tokens used by other API controllers. I've created 2 different JWT Schemes for "APItoken" and "MCPToken". But authoriztion does not work unless I force "MCPToken" scheme to be the default in Services.AddAuthentication(...).

To Reproduce

In Startup.cs:

// Server declaration
builder.Services.AddMcpServer()
  .WithHttpTransport(options =>
  {
    options.PerSessionExecutionContext = false;
    options.Stateless = true;
  })
  .AddAuthorizationFilters()
  .WithToolsFromAssembly();

// Authentication schemes
var authBuilder = builder.Services.AddAuthentication();
authBuilder.AddJwtBearer("APItoken", options => { ... });
authBuilder.AddJwtBearer("MCPtoken", options => { ... });

In MCP server definition:

[McpServerToolType]
[Authorize(AuthenticationSchemes = "MCPtoken")]
public class McpTools
{
 ...
}

Expected behavior
Tools list call should return the defined tool when proper authorization bearer header is set.

Additional context
The only way to make it work is to add "MCPtoken" scheme as default:

var authBuilder = builder.Services.AddAuthentication("MCPtoken");

Other things I've tried:

• Adding"AddMcp()" to authBuilder and setting ForwardAuthenticate to "MCPtoken"
• Creating a policy with AddAuthenticationSchemes("MCPtoken") and requiring the policy with [Authorize(Policy = ...)]

Inizia con la riproduzione in Startup.cs usando AddMcpServer(), AddAuthorizationFilters() e gli schemi JWT APItoken e MCPtoken. Traccia il modo in cui il trasporto HTTP MCP seleziona gli schemi di autenticazione per [Authorize(AuthenticationSchemes = "MCPtoken")], quindi verifica che tools/list abbia esito positivo con il token MCP senza rendere MCPtoken il valore predefinito a livello di applicazione.