Fred Johnson lies about his status as OPA. (He denies association, as I recall, when he is actually one of the leaders.)
also
Avasarala lies to her old friend in order to get Mars to inadvertently reveal strategic information.
[Sorry I don't have episode numbers--been a while since I watched it. I can assure you that in the books, there is a healthy amount of traditional lying, not just lying by omission.]