Hi @StephenOTT,
Each permission added for a specific filter is actually a new created authorization where Read permission is assigned and resource Id is the filter Id (You could see that newly created authorization on camunda Admin)
See below link
https://docs.camunda.org/manual/7.5/webapps/tasklist/filters/
Permissions - Specify which users or groups can see the filter. You can set the filter as globally accessible by selecting the checkbox Accessible by all users. A permission that is set here is equivalent to a READ permission which can also be set in Camunda Admin