Can access player struct in one class but not the other

I am filling two players' hands with random dominoes and have no issue. When I send the struct to another class, I cannot access the players hands anymore.

using namespace std;
struct player {
    int playerNum;
    vector < pair <int, int>> hand;
};
vector < pair <int, int>> availablePieces;

void Player::createHand(vector < pair <int, int>> &multiVector, player* player) {
    srand(time(NULL)); // rand seed
    int ranNumb;
    //fill players' hand
    for (int i = 0; i < 10; i++) {
        ranNumb = rand() % multiVector.size();
        player[0].hand.push_back(multiVector[ranNumb]);
        multiVector.erase(multiVector.begin() + ranNumb);
        ranNumb = rand() % multiVector.size();
        player[1].hand.push_back(multiVector[ranNumb]);
        multiVector.erase(multiVector.begin() + ranNumb);
    }
setAvailablePieces(multiVector);
Game gameObj;
gameObj.API(player, availablePieces);

Game Header:

using namespace std;
class Game
{
public:
    void API(struct player* player, vector < pair <int, int>> &availablePieces);
private:
    void playGame(player* player, vector < pair <int, int>>& availablePieces);
};

Game Class:

void Game::playGame(player* player, vector < pair <int, int>>& availablePieces) {
    cout << player[0].hand[0].first << endl;
}
void Game::API(player* player, vector < pair <int, int>> &availablePieces) {
    playGame(player, availablePieces);
}

In the function playGame, I cannot access the individual players hands. I get the error: Expression must be a pointer to a complete object type.