  Let $(X_{k})_{k\geq 1}$ and $(Y_k)_{k\geq 1}$ be the sequence of $X$ and
$Y$-coordinates of the positive integer solutions $(x, y)$ of the equation $x^2
- dy^2 = t$. In this paper we completely describe those recurrence sequences
such that sums of two terms recurrence sequences in the solution sets of
generalized Pell equations are infinitely many. Further, we give an upper bound
for the number of such terms when there are only finitely many of them. This
work is motivated by the recent paper Hajdu and Sebesty\'en (Int. J. Number
Theory 18 (2022), 1605-1612).
