Oracle error
ORA-65096
ORA-65096: invalid common user or role name
What usually causes it
You tried to create a user or role in the CDB root without the C## prefix.
What to check first
For a local user, switch to the PDB first (ALTER SESSION SET CONTAINER = pdb). For a common user, prefix the name with C##.
Scripts that help
- Pluggable databases and their stateEvery PDB with its open mode, whether it's restricted, when it opened and its size. RESTRICTED = YES usually means a plug-in violation.