Thanks for quick response, and yes, I tried All Channels and Youtube TV as the sources, and the sports channels I was looking for weren't available...
BUT - I've been playing around and I think I figured it out. I am moving from Sling to YTTV and had both of those sources (plus my HDHR4k) connected. Sling was first until I added Youtube today. My hypothesis is that the "Channel Collections" feature doesn't know how to handle multiple streaming sources (where they both have the same channels, but one doesn't support TVE). In my specific circumstance, hence the reason I'm moving to YTTV, Sling was my first source and Sling TVE doesn't support those sports channels that were not showing up. It didn't matter whether I selected all or YTTV.
I'm fairly confident of that bug, as I eventually removed Sling from my configuration and voila - sports channels are not available 