/usr/share/accountsservice/interfaces/com.canonical.TelephonyServiceApprover.xml is in telephony-service 0.1+16.04.20160331.4-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/accountsservice/interfaces/../../dbus-1/interfaces/com.canonical.TelephonyServiceApprover.xml