"No matching credentials in Subject!" with shared security domains in JBoss EAP

Issue

• Multiple configured datasources share a single security domain
• Encountering No matching credentials in Subject! and IJ000456: Unchecked throwable ... errors

... javax.resource.ResourceException: IJ000456: Unchecked throwable in ManagedConnection.getConnection() ...
  at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:533)
  at org.jboss.jca.adapters.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:143)
  ...
Caused by: javax.resource.ResourceException: No matching credentials in Subject!
  at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnectionFactory.getConnectionProperties(BaseWrapperManagedConnectionFactory.java:965)
  at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnection.checkIdentity(BaseWrapperManagedConnection.java:845)
  at org.jboss.jca.adapters.jdbc.BaseWrapperManagedConnection.getConnection(BaseWrapperManagedConnection.java:466)
  at org.jboss.jca.core.connectionmanager.AbstractConnectionManager.allocateConnection(AbstractConnectionManager.java:519)
  ...