Sounds like the modem may have lost its provisioning in their backend.
I'm going to escalate your issue to the Comcast corporate employees that are available to these boards.
They will be able to confirm that the provisioning and account data in their database is correct and complete. Good luck.
Hi, pianoman03. Welcome to the community. Thanks for posting. We're glad that you chose to reach out here for support. It's frustrating to hear about what has taken place with your self-install. While they aren't guaranteed to work because of several premise related factors, it's unusual that yours was working and then stopped. The sequence of events that you listed leads me to believe that the service order may have accidentally been cancelled, instead of only the service appointment specifically. Either way, let's see what we can do to get your service working again. We'd hate for you to discontinue the service and I'd appreciate the opportunity to help. I can look into this for you and see what I can do to help you get everything squared away. Please send me a private message with your name and I will reply from there.
To send a private message, please click my name "ComcastMorgan" then select "Send a Message" on the right side.
Thank you, I look forward to working with you on resolving this.
Hello again, Pianoman03. I have completed this interaction because I ended up not hearing back from you on it. If you do end up needing further support with this, please send me that private message. Thank you.