TDE setup in oracle 19c multitenant

Set the TDE Master Encryption Key for CDB$ROOT & PDBs

administer key management set key using tag 'master key' identified by ******** with backup using 'masterbackup';

OR

administer key management set key identified by ******* with backup container=ALL;

Failing with same error as below.

ORA-46623: cannot create the keystore file name