...
There is no additional configuration required to use role prefixes. However, be sure that your roles are stored in your database with the prefixes! In other words, assuming your role names are stored in the ROLE column of the ROLES table, if you executed a SELECT ROLE FROM ROLES, you would see:
ROLE |
|---|
MY_ROLE_PREFIX_AUTHENTICATED |
MY_ROLE_PREFIX_CEO |
...omitted... |