Missing OnDemand episode

I was going to binge watch the last season of Law & Order: SVU season 27 before the next season starts, but it seems that episode 3 (A vicious circle) is only available to buy, even though it's available on NBC.com using my xfinity login.   

Can someone please look into this, I pay the outrageous cable costs so that I can watch things on my TV, not on phone or computer screen.