I don’t think you’re getting my point. Yes, I know it is available online via computer but I can’t get it on my cell phone on iHeartRadio any more. That is where it counts for me.
Sorry, you could add the Blaze app, its free and the radio is included.
Delete the channel from your favorites, search for and play the channel, then re-add it to your favorites. I was having the same problem and it worked for me.