The MySQL authentication_oci plugin has certain limitations for the MySQL Server and the client applications that use it.

Client application limitations:

• In MySQL Shell prior to version 8.0.33, the OCI config file must be present in the default location of your platform.

Server limitations:

• You can assign multiple groups from a single tenancy in a CREATE USER statement only. To assign groups from other tenancies, you must define a CREATE USER statement for each tenancy. See Connecting With a Mapped Proxy User.