My checkTie() function is not working correctly

Question

I am working on my college project where we have to create a Tic-Tac-Toe game and I am completely made the game but for some reason, my checkTie() function is not working everything else is working completely fine. I can't find a solution to fix the problem. Can someone guide me through how I can fix it?

void checkTie(){
                                                                                             
int tie = 0;                                                                                                
for (int i = 0; i < 3; i++)                                                                                 
{
    for (int j = 0; j < 3; j++)                                                                             
    {
        if (board[i][j] == "")                                                                             
        {
            tie++;                                                                                          
            cout << "\n\n\t\tTIE!" << endl;                                                                 
            gamesPlayed++;                                                                                  
            gamesTied++;                                                                                    

            ttt.setGamePlayed(gamesPlayed);                                                                 
            ttt.setGameTied(gamesTied);                                                                     

            whoWon = "\n\n\t\tTIE!";                                                                        
            howWon = "\nThis was a Tie between Player and Computer!!";                                      

            ttt.setWhoWon(whoWon);                                                                          
            ttt.setHowWon(howWon);                                                                          

            ttt.writeResults();                                                                                                                                

            displayBoard();                                                                                 
            anotherTurn();                                                                                  
        }
    }
  }       
}