diff --git a/Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs b/Vonage.Test/SimSwap/Authenticate/AuthenticateRequestTest.cs
similarity index 54%
rename from Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs
rename to Vonage.Test/SimSwap/Authenticate/AuthenticateRequestTest.cs
index 34e37d4d..ea17f347 100644
--- a/Vonage.Test/SimSwap/Authenticate/AuthenticateRequest.cs
+++ b/Vonage.Test/SimSwap/Authenticate/AuthenticateRequestTest.cs
@@ -1,34 +1,45 @@
 using FluentAssertions;
 using Vonage.Common.Failures;
+using Vonage.SimSwap.Authenticate;
 using Vonage.Test.Common.Extensions;
 using Xunit;
 
 namespace Vonage.Test.SimSwap.Authenticate;
 
 [Trait("Category", "Request")]
-public class AuthenticateRequest
+public class AuthenticateRequestTest
 {
+    private const string ValidScope = "scope=test";
+    
     [Theory]
     [InlineData("")]
     [InlineData(" ")]
     [InlineData(null)]
     public void Parse_ShouldReturnFailure_GivenNumberIsNullOrWhitespace(string value) =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse(value).Should()
+        AuthenticateRequest.Parse(value, ValidScope).Should()
             .BeFailure(ResultFailure.FromErrorMessage("Number cannot be null or whitespace."));
     
+    [Theory]
+    [InlineData("")]
+    [InlineData(" ")]
+    [InlineData(null)]
+    public void Parse_ShouldReturnFailure_GivenScopeIsNullOrWhitespace(string value) =>
+        AuthenticateRequest.Parse("1234567", value).Should()
+            .BeParsingFailure("Scope cannot be null or whitespace.");
+    
     [Fact]
     public void Parse_ShouldReturnFailure_GivenNumberContainsNonDigits() =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("1234567abc123").Should()
+        AuthenticateRequest.Parse("1234567abc123", ValidScope).Should()
             .BeFailure(ResultFailure.FromErrorMessage("Number can only contain digits."));
     
     [Fact]
     public void Parse_ShouldReturnFailure_GivenNumberLengthIsHigherThan7() =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456").Should()
+        AuthenticateRequest.Parse("123456", ValidScope).Should()
             .BeFailure(ResultFailure.FromErrorMessage("Number length cannot be lower than 7."));
     
     [Fact]
     public void Parse_ShouldReturnFailure_GivenNumberLengthIsLowerThan15() =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("1234567890123456").Should()
+        AuthenticateRequest.Parse("1234567890123456", ValidScope).Should()
             .BeFailure(ResultFailure.FromErrorMessage("Number length cannot be higher than 15."));
     
     [Theory]
@@ -37,14 +48,23 @@ public void Parse_ShouldReturnFailure_GivenNumberLengthIsLowerThan15() =>
     [InlineData("+1234567890", "1234567890")]
     [InlineData("+123456789012345", "123456789012345")]
     [InlineData("+++1234567890", "1234567890")]
-    public void Parse_ShouldReturnSuccess_GivenNumberIsValid(string value, string expected) =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse(value).Map(number => number.PhoneNumber.Number).Should()
+    public void Parse_ShouldSetNumber(string value, string expected) =>
+        AuthenticateRequest.Parse(value, ValidScope)
+            .Map(request => request.PhoneNumber.Number)
+            .Should()
             .BeSuccess(expected);
     
+    [Fact]
+    public void Parse_ShouldSetScope() =>
+        AuthenticateRequest.Parse("1234567", ValidScope)
+            .Map(request => request.Scope)
+            .Should()
+            .BeSuccess(ValidScope);
+    
     [Fact]
     public void BuildAuthorizeRequest()
     {
-        var request = Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789").GetSuccessUnsafe();
+        var request = AuthenticateRequest.Parse("123456789", ValidScope).GetSuccessUnsafe();
         request.BuildAuthorizeRequest().Number.Should().Be(request.PhoneNumber);
     }
 }
\ No newline at end of file
diff --git a/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs b/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs
index f8becb43..633cddc8 100644
--- a/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs
+++ b/Vonage.Test/SimSwap/Authenticate/AuthorizeRequestTest.cs
@@ -1,4 +1,5 @@
-using Vonage.Test.Common.Extensions;
+using Vonage.SimSwap.Authenticate;
+using Vonage.Test.Common.Extensions;
 using Xunit;
 
 namespace Vonage.Test.SimSwap.Authenticate;
@@ -8,7 +9,7 @@ public class AuthorizeRequestTest
 {
     [Fact]
     public void GetEndpointPath_ShouldReturnApiEndpoint() =>
-        Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("123456789")
+        AuthenticateRequest.Parse("123456789", "scope")
             .Map(request => request.BuildAuthorizeRequest())
             .Map(r => r.GetEndpointPath())
             .Should().BeSuccess("oauth2/bc-authorize");
diff --git a/Vonage.Test/SimSwap/Authenticate/E2ETest.cs b/Vonage.Test/SimSwap/Authenticate/E2ETest.cs
index 7ab8df50..d580bac1 100644
--- a/Vonage.Test/SimSwap/Authenticate/E2ETest.cs
+++ b/Vonage.Test/SimSwap/Authenticate/E2ETest.cs
@@ -33,7 +33,8 @@ public async Task Authenticate()
             .RespondWith(Response.Create().WithStatusCode(HttpStatusCode.OK)
                 .WithBody(this.Serialization.GetResponseJson(nameof(SerializationTest.ShouldDeserializeAccessToken))));
         await this.Helper.VonageClient.SimSwapClient
-            .AuthenticateAsync(Vonage.SimSwap.Authenticate.AuthenticateRequest.Parse("447700900000"))
+            .AuthenticateAsync(AuthenticateRequest.Parse("447700900000",
+                "scope=openid dpv:FraudPreventionAndDetection#check-sim-swap"))
             .Should()
             .BeSuccessAsync(new AuthenticateResponse("ABCDEFG"));
     }
diff --git a/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs b/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs
index 240a42fc..ae682eed 100644
--- a/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs
+++ b/Vonage/SimSwap/Authenticate/AuthenticateRequest.cs
@@ -1,5 +1,6 @@
 using Vonage.Common;
 using Vonage.Common.Monads;
+using Vonage.Common.Validation;
 
 namespace Vonage.SimSwap.Authenticate;
 
@@ -12,17 +13,29 @@ public readonly struct AuthenticateRequest
     ///     Parses the input into an AuthenticateRequest.
     /// </summary>
     /// <param name="number">The phone number.</param>
+    /// <param name="tokenScope">The authorization scope for the token.</param>
     /// <returns>Success if the input matches all requirements. Failure otherwise.</returns>
-    public static Result<AuthenticateRequest> Parse(string number) =>
+    public static Result<AuthenticateRequest> Parse(string number, string tokenScope) =>
         PhoneNumber.Parse(number).Map(phoneNumber => new AuthenticateRequest
-        {
-            PhoneNumber = phoneNumber,
-        });
+            {
+                PhoneNumber = phoneNumber,
+                Scope = tokenScope,
+            })
+            .Map(InputEvaluation<AuthenticateRequest>.Evaluate)
+            .Bind(evaluation => evaluation.WithRules(VerifyScope));
     
     /// <summary>
     ///     Subscriber number in E.164 format (starting with country code). Optionally prefixed with '+'.
     /// </summary>
     public PhoneNumber PhoneNumber { get; private init; }
     
+    /// <summary>
+    ///     The authorization scope for the token.
+    /// </summary>
+    public string Scope { get; private init; }
+    
+    private static Result<AuthenticateRequest> VerifyScope(AuthenticateRequest request) =>
+        InputValidation.VerifyNotEmpty(request, request.Scope, nameof(request.Scope));
+    
     internal AuthorizeRequest BuildAuthorizeRequest() => new AuthorizeRequest(this.PhoneNumber);
 }
\ No newline at end of file
diff --git a/Vonage/SimSwap/Check/CheckRequest.cs b/Vonage/SimSwap/Check/CheckRequest.cs
index c0efdc2c..aee019c1 100644
--- a/Vonage/SimSwap/Check/CheckRequest.cs
+++ b/Vonage/SimSwap/Check/CheckRequest.cs
@@ -3,8 +3,10 @@
 using System.Text.Json.Serialization;
 using Vonage.Common;
 using Vonage.Common.Client;
+using Vonage.Common.Monads;
 using Vonage.Common.Serialization;
 using Vonage.Serialization;
+using Vonage.SimSwap.Authenticate;
 
 namespace Vonage.SimSwap.Check;
 
@@ -42,6 +44,15 @@ private StringContent GetRequestContent() =>
     [JsonPropertyName("maxAge")]
     public int Period { get; internal init; }
     
+    /// <summary>
+    ///     The authorization scope for the token.
+    /// </summary>
+    [JsonIgnore]
+    public string Scope => "scope=openid dpv:FraudPreventionAndDetection#check-sim-swap";
+    
+    internal Result<AuthenticateRequest> BuildAuthenticationRequest() =>
+        AuthenticateRequest.Parse(this.PhoneNumber.NumberWithInternationalIndicator, this.Scope);
+    
     /// <summary>
     ///     Initializes a builder.
     /// </summary>
diff --git a/Vonage/SimSwap/SimSwapClient.cs b/Vonage/SimSwap/SimSwapClient.cs
index a2329c36..d0adb260 100644
--- a/Vonage/SimSwap/SimSwapClient.cs
+++ b/Vonage/SimSwap/SimSwapClient.cs
@@ -37,8 +37,8 @@ private VonageHttpClient BuildClientWithAuthenticationHeader(AuthenticationHeade
     private static AuthenticationHeaderValue BuildAuthenticationHeader(AuthenticateResponse authentication) =>
         authentication.BuildAuthenticationHeader();
     
-    private Task<Result<AuthenticateResponse>> AuthenticateCheckRequest(CheckRequest r) =>
-        this.AuthenticateAsync(AuthenticateRequest.Parse(r.PhoneNumber.NumberWithInternationalIndicator));
+    private Task<Result<AuthenticateResponse>> AuthenticateCheckRequest(CheckRequest request) =>
+        this.AuthenticateAsync(request.BuildAuthenticationRequest());
     
     private static AuthenticateResponse BuildAuthenticateResponse(GetTokenResponse response) =>
         new AuthenticateResponse(response.AccessToken);