How to write a validation rule not to allow multiple phones of same type?

Summary:

Existing autocomplete rule on Person Phone business object is erroring out on redwood Add a Contingent Worker flow for Line Managers but no error for HR Admins. I would like to try validation rules in VBS. Request inputs on how to write a validation rule not to allow multiple phones of same type.

Content (please ensure you mask any confidential information):

Existing autocomplete rule on Person Phone business object is erroring out on redwood Add a Contingent Worker flow for Line Managers but no error for HR Admins.

Similar Autocomplete rule created on Person Email Object is not causing error.