Bally Sun Sports, formerly Fox Sun Sports.
Ironically, I live about 90 miles from Miami (which is the focus of Sun Sports) but about 150 miles from Orlando (which is the focus of Bally Sports Florida). Bally Florida is NOT DRM'd but Sun is. Both are definitely in my package with Xfinity... both work just fine through Xfinity boxes (at neighbors homes) or their app on my TV. BS Florida (HD) works just fine through Channels but Sun will not play (SD only, illustrating I'm approved to get SUN too, but it can't play due to DRM).
Bally has their own app too. Last year- the first year Xfinity DRM'd Sun, the Bally app was the workaround for HD games. This year, that app will play less important content on Sun but then "this content is not available in your area" for actual games like Miami Heat games.
The ONLY option this year for SUN in HD without leasing an Xfinity box is the Xfinity app on AppleTV.
Incidentally, 2 years ago and backwards in time, both RSNs also worked in TVE. But DRM knocks that out too.
So, it is important to get a sense of what works with your cable provider and what is DRM'd if you want to use Prime + cablecard. If you don't get a favorite channel(s) due to DRM, there may be workaround as dedicated apps or a cable company's own app. Else, it may be "lease our cable box or bust" for select programming you desire.