ASP.Net Core Entity Framework Error: invalid object name dbo

Hello guys, i am bulding asp.net core2.1 web app using Entity Framework, i want to create database automatically when i run the programm,

my appsettings.json`

{
  "Logging": {
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "AllowedHosts": "*",
  "DbConfig": {
    "ConnectionString": "Server=**********;uid=*****;Password=*******;Database=TestDb;Trusted_Connection=True;Integrated Security=false;"
  }
}

my model`

 [Table("User", Schema = "dbo")]
    public class User : Iuser
    {
        [Key]
        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int? Id { get; set; }
        [Column(TypeName = "varchar(20)")]

        public string FirstName { get; set; }
        [Column(TypeName = "varchar(20)")]

        public string LastName { get; set; }
        [Column(TypeName = "varchar(20)")]

        public string Email { get; set; }
        [NotMapped]
        public string Password { get; set; }
        [NotMapped]
        public string ConfirmPassword { get; set; }
        [Column(TypeName = "varchar(20)")]

        public string Hash { get; set; }
        [Column(TypeName = "varchar(20)")]

        public string Salt { get; set; }
        [Column(TypeName = "varchar(20)")]

        public DateTime? CreatedOn { get; set; }
}

my context`

public class UserContext : BaseDbContext
    {
        public DbSet<User> Users { get; set; }

        public UserContext(){}

        public UserContext(DbContextOptions<UserContext> options):base(options) { }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlServer("Server=******;uid=*****;Password=*******;Database=TestDb;Trusted_Connection=True;Integrated Security=false;");
            }
        }
        
        public void AddUser(User entity)
        {
            using (UserContext context = new UserContext())
            {
                entity.CreatedOn = DateTime.Now;
                context.Users.Add(entity);
                context.SaveChanges();
            }

        }
    }

but when i run the code, it shows SQLexception: invalid object name 'dbo....' ERROR, any ideas?