Custom Token Provider in ASP.NET Core 6 Failing with 'Invalid Token' Error on API Calls
I'm implementing a custom token provider in my ASP.NET Core 6.0 application, but I'm encountering an 'Invalid Token' error when trying to authenticate API calls. I've set up a custom `IAuthenticationSchemeProvider` and a custom token validation logic. However, when I attempt to validate the token in my middleware, it fails despite the token being correctly generated. Here's an overview of my implementation: The token generation looks like this: ```csharp var claims = new[] { new Claim(JwtRegisteredClaimNames.Sub, userId) }; var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(secretKey)); var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256); var token = new JwtSecurityToken( issuer: issuer, audience: audience, claims: claims, expires: DateTime.Now.AddMinutes(30), signingCredentials: creds ); return new JwtSecurityTokenHandler().WriteToken(token); ``` I've registered the authentication services in `Startup.cs` like this: ```csharp services.AddAuthentication(options => { options.DefaultAuthenticateScheme = JwtBearerDefaults.AuthenticationScheme; options.DefaultChallengeScheme = JwtBearerDefaults.AuthenticationScheme; }).AddJwtBearer(options => { options.TokenValidationParameters = new TokenValidationParameters { ValidateIssuer = true, ValidateAudience = true, ValidateLifetime = true, ValidateIssuerSigningKey = true, ValidIssuer = issuer, ValidAudience = audience, IssuerSigningKey = key }; }); ``` When calling my secured API endpoint, I receive the following error message: **"Invalid token"**. I've verified that the token hasn’t expired and the audience and issuer are correct. To troubleshoot, I've added logging in the `JwtBearerEvents` configuration, but it seems like the token isn't being processed correctly at all. Additionally, I've checked the token against a JWT decoder online, and it appears to be structured properly. I've also ensured that the secret key is consistent across both token generation and validation. Could there be any misconfiguration or common pitfalls I might be overlooking that could cause this 'Invalid Token' error?