Internal House Wiring No Longer Working with New Modem Installation

We have had Xfinity Voice, TV, and Internet since 2017. In addition to using the voice line for home phone service, we need it to connect to our community's Emergency Services Security System. The house is fully wired throughout for phone, internet, and cable. Over a month ago, Xfinity took us off our 8 year old legacy account, opened a new account at the same address, and gave us a new modem. Since connecting the new modem, we did not have a voice line. Yesterday, an Xfinity agent discovered that our phone line need a "CDL" designation (Comcast Data Line) and now the phone works. Mysteriously, our internal house wiring not longer has active ports. I plug the voice line into the Telephone Module and then plug a phone into the module and I have a dial tone so I know there is nothing wrong with the module. All of the ports on the module work. I have checked all the visible wiring connections on the phone module and everything is intact. I have seen multiple people post on Reddit with this same issue with no resolution. 

Furthermore, the "Advanced Forwarding Feature" on the voice line is not available. I previously set the advanced forwarding feature to have calls ring on the home phone AND on my cell phone simultaneously. That way I can answer a call in any room when I am home or answer on my cell when I am out. When I had a very technical Comcast rep at the local store work with their Tier 2 support  on the "no voice line" issue, we finally got the voice line activated. We can make and receive calls after testing with the Tier 2 Tech. However, she says the account gives a message that there is a "customer wiring issue".  She couldn't even see the "advanced forwarding feature" on her end. Seems like maybe this is all connected. Any ideas. Tech is coming today. Hopefully we get some credible support. We have spent well over 15 hours working with Xfinity on this. I usually I drive to the Xfinity store when I have an Xfinity tech on the phone so they can listen to everything the store  rep has done and  we don't have to start from ground zero each time.