Use CVX 2.2 with Mosek 9.2 if available to you. otherwise, follow the directions at CVXQUAD: How to use CVXQUAD's Pade Approximant instead of CVX's unreliable Successive Approximation for GP mode, log, exp, entr, rel_entr, kl_div, log_det, det_rootn, exponential cone. CVXQUAD's Quantum (Matrix) Entropy & Matrix Log related functions .if things are still not good, the read my warnings in many posts on this forum about the perils of (crude) SCA.