Oracle Error Message
ORA-28397: cannot online file string since it has a passphrase-wrapped key
Reason for the Error
The encrypted tablespace file was rewrapped using passphrase through the DBMS_TTS.PASSPHRASE_REWRAP_KEY procedure. Therefore it cannot be part of the database until it is converted by RMAN.
Solution
Do not attempt to online files with passphrase-wrapped keys.