Upgraded modem, account shows two - need to remove the ARRIS S33 from my account

u/gdaswani Good morning! Thank you so much for reaching out to us here on our Xfinity Subreddit page. We truly appreciate your patience, and our team is available seven days a week to ensure you get the support you need with your account. I have located your Modmail message and will be responding there momentarily with the next steps to get everything taken care of for you. I look forward to chatting with you further!