If you are an existing Barracuda customer/partner, and you are an admin, you can log in CloudGen Access console with your Barracuda Cloud Control credentials.
If you are synchronizing your user directory with Barracuda Cloud Control, you can use Barracuda Cloud Control as your identity provider.
You can configure Barracuda Cloud Control to synchronize users with LDAP Active Directory or Azure Active Directory.
Check this article: Active Directory Authentication