In-Process API not returning User join date and last visited date.

Any other customizations like disabled plugins? I don't know of any reason why in-process API mapping would fail when REST mapping works - REST uses in-process API mapping as part of its mapping process.

You've confirmed that the requesting user has permission to view user profiles? That the context you're calling the in-process API in has a properly authenticated user?

We are not disabled any plugins.

Yes API user in Administrator role and user have Read user profiles permissions.

We are validating oauth token using "/api.ashx/v2/info.json" this api services. Before hitting the in-process api

Private void ProcessRequest(HttpContext context)
{
var token = context.Request.Headers["Authorization"];
            var apiUrl = ConfigurationManager.AppSettings["webApiUrl"];
            IEventLog eventLog = Telligent.Evolution.Extensibility.Apis.Get<IEventLog>();
            eventLog.Write("Before token validate", new EventLogEntryWriteOptions());

            if (token != null && IsTokenAuthenticated(token, apiUrl))
            {
                eventLog.Write("after token validate", new EventLogEntryWriteOptions());
                var userAPI = Telligent.Evolution.Extensibility.Apis.Get<IUsers>();
                var value = userAPI.Get(new UsersGetOptions { Username = "UserOne" });
                UsersListOptions options = new UsersListOptions();
                options.PageSize = userAPI.List().TotalCount;
                var rolelist = roles.List();
                UserResponse userResponse = new UserResponse();
                userResponse.TotalRecords = options.PageSize.Value;
                userResponse.PageNo = context.Request.QueryString["pageNo"] != null ? Convert.ToInt32(context.Request.QueryString["pageNo"]) : 1;
                userResponse.PageSize = context.Request.QueryString["pageSize"] != null ? Convert.ToInt32(context.Request.QueryString["pageSize"]) : 10000;
                eventLog.Write("Before consume user api", new EventLogEntryWriteOptions());
                var userList = userAPI.List(options).ToList();
                }
}
private bool IsTokenAuthenticated(string token, string apiUrl)
    {
        var oauthKey = String.Format("{0} {1}", "OAuth", token.ToString());
        var restRequest = WebRequest.Create(apiUrl + "/api.ashx/v2/info.json") as HttpWebRequest;
        restRequest.Method = "Get";
        restRequest.Headers.Add("Authorization", oauthKey);
        string restResponse = null;
        ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;
        using (var webRESTResponse = (HttpWebResponse)restRequest.GetResponse())
        {
            var stream = webRESTResponse.GetResponseStream();
            if (stream != null)
            {
                using (var reader = new StreamReader(stream))
                {
                    restResponse = reader.ReadToEnd();
                }
            }
        }

        return restResponse != null ? true : false;
    }