Alexa Powerview Scenes Stopped Working

Yesterday my Powerview Scenes on Alexa stopped working. I've tried disabling the skill and reenabling it. I added a new scene in the Powerview App and I see it shows up in Alexa, but whenever I try to activate any Powerview Scene, Alexa just says "I'm not sure what went wrong with [name of scene]". Any idea what might have changed, what might be going wrong, or how to fix it? It's worked for 5 years without any real problems.