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ords can access the apex which is running in CDB.
How to set ORDS to run the APEX which is running in PDB?
(If it was set by CDB, how can I switch to PDB?)
uninstall ORDS from from CDB
install ords to PDB
ords 18.2 and higher do not support CDB installs, so this is the way to go
if you run ords 18.2 on your setup, it will automatically convert your CDB install to a PDB one