U-Verse TV. Receiver box does not match account settings

For years my LG TV has been connected and working fine with it's Cisco ISB 7005.  Three days ago the receiver to our Samsung TV was replaced and brought on line.  Suddenly the LG TV can not connect. Message: "This set top box does not match the account settings."  The ISB 7005 is not listed on the account page showing the receivers associated with my account.

    Automated phone system will not put me through to 24/7 tech support; claims it after hours.