How to reallocate/expand 2d array in C?

Question

I'm doing this board game that lets the players expand the board's columns or rows:

• The board is a 2d array dynamically allocated.

• If the player wanted, the game would add a line (or row).

• To add a row I need to allocate more memory to it right? I keep failing at it, idk what to try anymore..

Here is the code that starts the board in main:

  char** tabuleiro = malloc(sizeof(char*) * linhas);
  for(i = 0;i < linhas; i++)
    tabuleiro[i] = malloc(sizeof(char*) * colunas);

Here is the code that starts the aux in the function:

  char** insere_jogada(char** tab, jogador j, int* linhas, int*colunas){
  // (...)
  char** aux = tab;

Here is the code that would add a row:

  *linhas = *linhas + 1;
   aux = realloc(*tab, sizeof(char*)*(*linhas));
   //also tried: tab = malloc(sizeof(char*)*(*linhas));

   if(aux==NULL){
     printf("Error.\n");
     return tab;
   }

Here is the code that would add columns:

*colunas = *colunas + 1;
for(i = 0;i < *colunas; i++){
  aux[i] = realloc(*tab, sizeof(char*)*(*colunas));     

Whole function:

char** insere_jogada(char** tab, jogador j, int* linhas, int*colunas) {
  int l,c,i;
  char resposta, escolha;
  char** aux = tab;

  pede_espaco(&l,&c); // espaco q o jogador quer jogar
  resposta = check_jogada(tab[l][c], j); //jogada

  if(resposta=='A'){ // se escolher adicionar lin/col
    j.lincol--; //fica sem oportunidade de adicionar mais linhas/colunas

    escolha = pede_lincol(); // escolher entre adicionar linha ou coluna
    if(escolha == 'L'){
      printf("\nLines before %d",*linhas);
      *linhas = *linhas + 1;
       printf("\nLines after %d",*linhas);

      // ----
        aux = realloc(*tab, sizeof(char*)*(*linhas));
        //also tried: tab = malloc(sizeof(char*)*(*linhas));

        if(aux==NULL){
          printf("Error.\n");
          return tab;
        }
      //

    }
    else{
      *colunas = *colunas + 1;
      for(i = 0;i < *colunas; i++){
        aux[i] = realloc(*tab, sizeof(char*)*(*colunas));        
      }
    }
  }
  else{
    tab[l][c] = resposta;
  }

  return aux;
}

PS: Thank you in advance for your time and patience. This is a new topic for me so forgive me if I'm making an obvious/stupid mistake. :)