PDB Hot Cloning: PDB was placed into read only even though local undo is true

Hello,

I am running a 2 node RAC cluster with 3 PDBs, version 19.11 on RHEL8.2.

I attempted to perform a PDB clone from this RAC cluster into a different 2 node RAC cluster.

The cluster is in archive log mode and the PDB has LOCAL_UNDO_ENABLED set to true, but when I performed the clone via OEM, the PDB was transitioned into read only mode for the clone and then set back to read-write.

This was my first attempt at PDB cloning and reading the documentation. I expected the PDB to remain in read write mode whilst it was cloned. Have I misunderstood the hot clone method or is there something else I have to configure to enable hot cloning?