ORA-16914
Redo Apply Services were not started at the standby pluggable database.
Cause
Redo Apply Services were not started on the standby pluggable database.
Action
To start Redo Apply Services for all standby pluggable databases, use the ENABLE DATABASE command. To start Redo Apply Services for a single standby pluggable database, use the EDIT PLUGGABLE DATABASE SET STATE=APPLY-ON command.