Admin users can't see the user checkmarks for permissions in the members section.
Users are able to see their own user check mark permissions.
TAS 6.0.x
This issue occurs in environments with a large amount of users because the request to /v3/roles returning "414 URI Too Long" due to the inclusion of 500 user_guids in the GET URL.
This issue is resolved in Apps Manager release 677.0.64, which corresponds to TAS 6.0.11+LTS-T and newer.
As a workaround, reduce the pagination value in Apps Manager.
cf set-env apps-manager-js-blue API_PER_PAGE 50