Modem Upgraded Needed

I got an email from xfinity saying"Equipment upgrade needed
Switch to your supported modem today
You have more than one modem on your Xfinity account, including a supported modem that's ready to deliver a secure and reliable internet experience." It also said"Your current modem is no longer receiving the latest security updates. Without the latest features, the security and performance of your modem may be impacted over time. Over time, this may affect your modem's security and performance. Move your Xfinity service from your older modem to your supported modem that's already on your account to help keep your connection secure and reliable."

Unfotunately, I only see one Xfi modem on my account"