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I don't think this is a RAC specific error
ORA-24964: ALTER SESSION SET CONTAINER error
Cause: An attempt to switch to a PDB with different settings such as character set, time zone or time zone file version on an Oracle 12c Release 1 (12.1) or earlier client failed.
Action: Upgrade client to Oracle 12 Release 2 (or later) to support such operations.
ORDS v17.3 (BETA!!!) has the 12.2. driver in it, so you could try with that.
thank you. Will try that "thatjeff". trying ords based of your video and blog. Will update of my process once I try it.
Update: Was able to install ORDS v17.3 on Oracle 12.2 Database version successfully.
933094Apr 27 2012 — edited Nov 13 2012