BBN constraints on f(Q,T) gravity

$f(Q,T)$ gravity is a novel extension of the symmetric teleparallel where Lagrangian $L$ represented through an arbitrary function nonmetricity $Q$ and trace energy-momentum tensor $T$ \cite{fqt}. In this work, we have constrained widely used model form $f(Q,T) = Q^{n+1} + m T$ from primordial abundances light elements to understand its viability in Cosmology. We report that can elegantly explain observed Helium Deuterium while Lithium problem persists. From constraint on expansion factor range $0.9425 \lesssim Z \lesssim1.1525$, strict constraints parameters $m$ $n$ $-1.13 n -1.08$ $-5.86 \lesssim12.52$ respectively.