The shepherd_config 'EnableCertificates' is no longer visible through the shepherd_config.php page, resolution requires access to the database in MS SQL Server Management Studio.
1. Run the query below to check the value listed for 'EnableCertificates':
use das;
select * from dbo.shepherd_configs (nolock) where name like '%enablecertificates%'
2. Check that the value is listed as 'false', and run the following to update it to 'true'
update dbo.shepherd_configs
set value = 'true'
where name = 'EnableCertificates'
3. Restart App Control Services, log in and confirm that the issue is resolved.