Javascript exception 'ReferenceError: utag is not defined' when pressing "add" on Simultaneous Ring phone tool

Trying to add nomorobo phone number per the instructions. When I press "add" after typing in the phone number I get the following exception about "utag" not being defined. This happens in both Chrome and Edge and is repeatable.This also happens if I try to add a new contact in the "Contacts" tool. Any suggestions?

vendor.js:107 ReferenceError: utag is not defined
at phonetools.cox.com/.../phonetools.concat.min.js:9:10278
at n.$emit (phonetools.cox.com/.../vendor.js:135:113)
at n.$scope.settingToggle (phonetools.cox.com/.../phonetools.concat.min.js:8:26562)
at fn (eval at compile (phonetools.cox.com/.../vendor.js:212:409), <anonymous>:4:771)
at phonetools.cox.com/.../vendor.js:388:160
at n.$eval (phonetools.cox.com/.../vendor.js:133:221)
at n.$apply (phonetools.cox.com/.../vendor.js:133:451)
at HTMLButtonElement.<anonymous> (phonetools.cox.com/.../vendor.js:388:142)
at HTMLButtonElement.c (phonetools.cox.com/.../vendor.js:35:217) undefined
(anonymous) @ vendor.js:107

vendor.js:107 ReferenceError: utag is not defined
at n.$scope.addSimRingNumber (phonetools.cox.com/.../phonetools.concat.min.js:9:3187)
at fn (eval at compile (phonetools.cox.com/.../vendor.js:212:409), <anonymous>:4:275)
at phonetools.cox.com/.../vendor.js:388:160
at n.$eval (phonetools.cox.com/.../vendor.js:133:221)
at n.$apply (phonetools.cox.com/.../vendor.js:133:451)
at HTMLButtonElement.<anonymous> (phonetools.cox.com/.../vendor.js:388:142)
at HTMLButtonElement.c (phonetools.cox.com/.../vendor.js:35:217) undefined
(anonymous) @ vendor.js:107