Remove a tag from a contact by the tag's id, without first looking up the id of the contactTag row that links them — which is what Remove a tag from a contact takes. To remove the tag by name instead, use Remove a tag from a contact by name; sending both a tag id in the path and a tag name is a 400.

Only the association is removed: the tag itself and the contact both remain.

Requires permission to edit contacts and access to the contact.