Xfinity flex not working

My Xfinity flex isn’t working. When I turn on my tv using the flex remote, there’s an error screen telling me to call 1-800-Xfinity and a code in the bottom right corner of the screen XRE-00250. I’ve tried hitting the refresh button, turning it off and on, and unplugging it. I let it sit overnight but it’s still not working. I’ve called and tried the chat bot, but the bots don’t know what I need help with and haven’t put me in touch with a live agent.