Api report custom header add role

so i still dont know how to use custom header but i figured ouut how to add roles using the GenerateTokenRequest object and the GenerateTokenInGroupWithHttpMessagesAsync call.

    private async Task<string> GetTokenCredentials()
        {
            var credential = new UserPasswordCredential(powerBi.Value.Username, powerBi.Value.Password);

            // Authenticate using created credentials
            var authenticationContext = new AuthenticationContext(powerBi.Value.AuthorityUrl);
            var authenticationResult =
                await authenticationContext.AcquireTokenAsync(powerBi.Value.ResourceUrl, powerBi.Value.ClientId,
                    credential);

            if (authenticationResult == null)
            {
                Console.WriteLine("Authentication Failed");
                return string.Empty;
            }
            return authenticationResult.AccessToken;
        }



        public async Task<ActionResult> GetReportEmbedded()
        {
            // Create a user password credentials.
            var accessToken = await GetTokenCredentials();

            var tokenCredentials = new TokenCredentials(accessToken, "Bearer");

            // Generate Embed Token.

            using (var client = new PowerBIClient(new Uri(powerBi.Value.ApiUrl), tokenCredentials))
            using (Task<Group> tableTalkGroup = client.Groups.GetGroupsWithHttpMessagesAsync()
                .ContinueWith(task => task.Result.Body.Value.First(group => @group.Name == "Tuku TEST")))
            using (Task<Report> reportTask = client.Reports.GetReportsInGroupWithHttpMessagesAsync((await tableTalkGroup).Id).ContinueWith(task => task.Result.Body.Value.First(report => report.Name == "DirectQueryPC")))

            {
                var generateTokenRequestParameters = new GenerateTokenRequest(
                    accessLevel: "View",
                    datasetId: null,
                    identities: new List<EffectiveIdentity>
                    {
                        new EffectiveIdentity(
                            username: powerBi.Value.Username,
                            roles: new List<string> { "filterKel" },
                            datasets: new List<string> { (await reportTask).DatasetId })
                    });

                var tokenResponse = await client.Reports.GenerateTokenInGroupWithHttpMessagesAsync(
                    groupId: (await tableTalkGroup).Id,
                    reportKey: (await reportTask).Id,
                    requestParameters: generateTokenRequestParameters);
                // Generate Embed Configuration.
                var embedConfig = new EmbedConfig()
                {
                    EmbedToken = tokenResponse.Body,
                    EmbedUrl = (await reportTask).EmbedUrl,
                    Id = (await reportTask).Id
                };

                return View(embedConfig);
            }
        }