Hi Mohanish,
I think you are using version 4.0 of oxd. Please confirm. We donot provide wordpress plugin support to oxd with version >= 4.0.
There might be other OpenID Connect or SAML wordpress plugins that are better now. We stopped working on that when other OpenID Connect plugins came out.
For oxd-4.0 you will find oxd-server `port` in `/opt/oxd-server/conf/oxd-server.yml` in `server.applicationConnectors.port` field. Please check `https://gluu.org/docs/oxd/4.0/configuration/oxd-configuration/` link for details
Regards,
Arnab