Answer
Check the SSL wallet path value stored in the environment configuration table this license-check call chain reads from — it uses UTL_HTTP over SSL, which depends on a correctly configured Oracle wallet path, and an Oracle database version upgrade can leave that stored path pointing at a wallet location that's no longer correct. Update the stored SSL wallet path with the correct current value (per the relevant F1 documentation's database-update guidance) to resolve the error on employee creation or reactivation.