Paid for NBA League Pass on the NBA site. Linked it to my Xfinity account. Can't watch any League Pass games from my channel guide

Description says it all.  Any attempt to select an NBA League Pass game from the channel guide results in a message telling me I must upgrade.  NBA site says I'm paid for the year, and Xfinity is my TV Provider.  How do I get this recognized on my Xfinity account?