/// <inheritdoc />
        public async Task <IReadOnlyList <UserModel> > GetUsersWithClaim(string product, string claim)
        {
            // Validate parameters.
            if (string.IsNullOrEmpty(product))
            {
                throw new ArgumentNullException(nameof(product));
            }
            if (string.IsNullOrEmpty(claim))
            {
                throw new ArgumentNullException(nameof(claim));
            }

            // Validate user exists and is loaded.
            if (user == null || !user.IsLoaded)
            {
                throw new NotAuthorizedException($"Method {nameof(GetUsersWithClaim)} Requires a loaded {nameof(IdentityUser)}.");
            }

            // Get path name from app settings.
            var path = microservicesWrapper.GetPathByName(IdentityB2bClientName, "GetUsersWithClaim");

            // Check if path exists, if not throw.
            if (string.IsNullOrEmpty(path))
            {
                throw new ConfigurationErrorsException($"Microservice Configuration For {IdentityB2bClientName} not found or is invalid. Please ensure you have a valid configuration set in your appsettings for the IdentityB2B Microservice!");
            }

            // Populate claim and product into path and create HttpReqeustMessage.
            var fullPath = string.Format(path, claim, product);
            var message  = new HttpRequestMessage(HttpMethod.Get, fullPath);

            // Add Identity User headers needed in the Identity B2B Microservice query.
            var headers = user.ToDictionary();

            foreach (var(key, value) in headers)
            {
                message.Headers.Add(key, value.ToString());
            }

            // Send request and ensure it was a successful request.
            var response = await identityB2bHttpClient.SendAsync(message);

            response.EnsureSuccessStatusCode();

            // Read response to List of UserModel and return.
            await using var responseStream = await response.Content.ReadAsStreamAsync();

            using var streamReader   = new StreamReader(responseStream);
            using var jsonTextReader = new JsonTextReader(streamReader);
            return(serializer.Deserialize <List <UserModel> >(jsonTextReader));
        }