Any of the Web Service Provider profiles can be enabled for signing by configuring them to use X.509 for their message-level security mechanism.
To view your current configuration:
Click Devices > Identity Servers > Edit > Liberty > Web Service Provider.
Click the name of a profile, then click Descriptions.
Click the Description Name.
If either Peer entity = None, Message=X509 or Peer entity = MutualTLS, Message=X509 has been selected as the security mechanism, signing has been enabled for the profile.