Why are seasons one and two missing on on demand for Yellowstone?
On Demand Season episodes are provided to Spectrum and all other TV program rental services through the host station. Spectrum can only provide what the host station gives to them for On Demand Content. You would need to contact Country Music Television through social media. Provide to them that you get CATV services through Spectrum and ask that CMT be added to Spectrum's On Demand Line-Up.
Current show content typically shows up within 2-7 days of the host station's airing. As for other content, it is totally the station's call as to when they release shows to On Demand. Here is CMT's Twitter page. Probably the best way to reach them:
Hi @Rosie123 Welcome to the community!
The CMT app is available with your Spectrum credentials. You can watch online and through a number of other devices. You can check out what other apps/channels are available here: https://www.spectrum.net/support/tv/tv-channel-apps/ In many cases those channels own apps/websites will have additional content available.