Add address to account

The concern is not "Xfinity Home Security / Devices And Equipment" help related. Topic moved here to the proper help section, and for greater exposure to Comcast corporate employees (The Digital Care Team) for assistance. 

Could you please send our team a direct message with your full name and full address? Our team can most definitely take a further look at this issue.To send a "Direct Message" ("Private") message:
Click "Sign In" if necessary
• Click the "Direct Message chat" icon
• Click the "New message" (pencil and paper) icon
• Type "Xfinity Support" in the "To:" line and select "Xfinity Support" from the drop-down list which appears. The "Xfinity Support" graphic replaces the "To:" line
• Type your message in the text area near the bottom of the window

For anyone asking the same question:

two addresses = two accounts

You can't add an address to your existing account.  An account is not just "tied" to you, but to that address, so each address has its own account.