By Mike Dietrich-Oracle on Jul 07, 2014
Cloning of Pluggable Database in Oracle Multitenant is a great feature and very useful. It had just a tiny flaw in Oracle Database 184.108.40.206: Remote cloning from one to another CDB fails.
This will work flawless beginning with the first patch set Oracle 220.127.116.11 - but if you want to use that feature still in Oracle 18.104.22.168 you need to apply at least PSU3 or a single patch 18898403.
See the documentation: