migrate non-cdb to pdb with tde

Greetings,

i have 3 non-cdb oracle 19c databases with TDE enabled and each has a different encryption key.

I need to be able to move all 3 to 3 pdbs under 1 cdb using "create pluggable database with a db link " command.

When i tried to setup in an individual keystore at a pdb level , i got an error :

connect to pdb as sysdba

alter system set TDE_CONFIGURATION="KEYSTORE_CONFIGURATION=FILE";

*

ERROR at line 1:

ORA-32017: failure in updating SPFILE

ORA-12754: Feature 'Per-PDB TDE keystore' is disabled due to missing capability

'Runtime Environment'.

ADMINISTER KEY MANAGEMENT CREATE KEYSTORE IDENTIFIED BY tdepass;

ERROR at line 1: