ORA-46715
The keystore of the PDB is not in a closed state on all instances.
Cause
The TDE_CONFIGURATION for the pluggable database (PDB) cannot be modified because the keystore of the PDB is not in a closed state on all instances.
Action
Close the keystore of the PDB on all instances. If the PDB was configured to use an autologin keystore, then before attempting to update the configuration of the PDB, change the configuration of the PDB to use a password-based keystore, and close the keystore of the PDB.