Logged as 'anonymous' when configuring OAuth2 for OData using KeyCloak

After configuring OAuth2-Based Security for OData using Red Hat SSO [1], I have noticed, in the audit log file (teiid-audit.log), there is no longer information about this specific user. Indeed, JDV always logs the user as 'anonymous' .

10:29:55,132 DEBUG [org.teiid.AUDIT_LOG] (http-127.0.0.1:8080-1) [sample.1, null anonymous USERPASSWORD null null null false] <session.logon-request>
10:29:55,141 DEBUG [org.teiid.AUDIT_LOG] (http-127.0.0.1:8080-1) [anonymous@oauth] <session.logon-success>
10:29:55,432 DEBUG [org.teiid.AUDIT_LOG] (http-127.0.0.1:8080-1) OOjgSY3H+PdI [anonymous@oauth] <session.logoff>

[1] https://access.redhat.com/documentation/en-us/red_hat_jboss_data_virtualization/6.3/html/security_guide/chap-oauth-based_security_for_odata