Pluggable database's GUID shows as 0000000 in v$pdbs view.

Hi

I'm trying to get to the bottom of a long, slow support call with Oracle. I upgraded an Non-cdb 11g database to 19.3.14 and then ran though a procedure to convert and plug it in to a container database. All went fine except I have some errors in backups.

The only weird thing I see is that the guid for the PDB in the view v$pdbs is all zeros which looks very wrong to me. Anyone else seen this?

select name as name,guid,guid_base64 from v$pdbs; Check out MYPDB2

PDB$SEED

D9F5297738A91F06E0530A03F70AA5FE