xfinity app not working

As I said, I could not add the modem myself because the Xfinity app did not work.  After spending some time on the phone, I finally got to talk to somebody who added the modem to my account, but it still needs to be activated.  I have a voice cable modem so I cannot call and switch modems at the same time as disconnecting the modem disconnects the phone. 

I am glad to hear the modem is added. We can help to activate it here as well, user_3e9207. We do not get disconnected even if you leave the page and come back. We pick up right where we left off. 

Please send us a direct message with your full name and complete service address to “Xfinity Support”. To do so, click on the direct messaging icon located at the top right of this forums page.

Here's the detailed steps to direct message us:
• Click "Sign In" if necessary
• Click the "Direct Message” icon (upper right corner of this page)
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the to line and select "Xfinity Support" from the drop-down list
• Type your message in the text area near the bottom of the window
• Press Enter to send your message