Using restful api unable to get a list of users and roles and filter by role

Using restful api unable to get a list of users and roles and filter by role. If I filter by role.displayName I get a status 500 and 500 bad request. If the filter is removed the get runs fine. If I filter by userName the get runs fine. As soon as I try to filter by role.Displayname it errors. Below is the get statement where {{host}} is my url and I point <Role Name> to be discreet.

{{HOST}}/hcmRestApi/scim/Users?attributes=userName,roles.displayName&filter=role.displayName co "<Role Name>"