Linq to SQL added a Lambda .Join geting AnonymousType#1' does not contain a definition and no extension method

As join as I add in a Lambda .Join I am getting problem with my linq lambda .Where(..

 .Where(z => z.Inact_ind == "N" && z.Wwid != null)

That is fine UNTIL I add in .Join above it.

eg

.Join(Rpm_scrty_emp_info, z => z.Wwid, ei => ei.Wwid, (z, ei) => new{z,ei})

linq query

(Linqpad , so Rpm_scrty_rpm_usrs is essentially the same as dbcontext dbset)

var queryAllUsers = Rpm_scrty_rpm_usrs
            .Join(Rpm_scrty_emp_info, z => z.Wwid, ei => ei.Wwid, (z, ei) => new{z,ei})
            .Where(z => z.Inact_ind == "N" && z.Wwid != null)
            .AsEnumerable()
            .Select(z => new rpm_scrty_rpm_usr()
            {
                usr_id = z.Usr_id,
                usr_lnm = z.Usr_lnm,
                usr_pwd = z.Usr_pwd,
                usr_fnm = z.Usr_fnm,
                wwid = z.Wwid,
                apprvr_wwid = z.Apprvr_wwid,
                chg_dtm = z.Chg_dtm,
                chg_usr_id = z.Chg_usr_id,
                dflt_ste_id = z.Dflt_ste_id,
                cre_dtm = z.Cre_dtm,
                cre_usr_id = z.Cre_usr_id,
                lst_pwd_chg_dtm = z.Lst_pwd_chg_dtm,
                lst_accs_dtm = z.Lst_accs_dtm,
                email_id = z.Email_id,
                inact_ind = z.Inact_ind,
                salt = z.Salt,
                tel = z.Tel                 

                //});
            })
            .ToList();

Poco class

public class rpm_scrty_rpm_usr
{

    public string usr_id { get; set; }

    public string usr_fnm { get; set; }
    public string usr_lnm { get; set; }
    public string usr_pwd { get; set; }
    public string email_id { get; set; }
    public string wwid { get; set; }
    public string tel { get; set; }
    public int dflt_ste_id { get; set; }
    public DateTime? lst_pwd_chg_dtm { get; set; }
    public DateTime? lst_accs_dtm { get; set; }
    public string apprvr_wwid { get; set; }
    public string inact_ind { get; set; }
    public string cre_usr_id { get; set; }
    public DateTime? cre_dtm { get; set; }
    public string chg_usr_id { get; set; }
    public DateTime? chg_dtm { get; set; }
    public string salt { get; set; }


}