I don't know exactly what your end goal is, and how you will interface with 10duke, but I will note - in case it wasn't understood, you don't have to use FusionAuth to use the FusionAuth NodeBB OIDC plugin.
We chose to use NodeBB for the FusionAuth community forum, and we wanted to contribute our work back to the NodeBB community... and because we wanted our users to login using FusionAuth.
We started with the plugin that @julian published, and just extended it a bit, added OIDC features and made the configuration available in the NodeBB UI. There isn't anything in the code that is unique or custom for FusionAuth.
It should work with any OAuth2/OIDC IdP, if you find that it does not, open a bug and we'll be happy to fix it for you! This is sort of our specialty! https://github.com/FusionAuth/nodebb-plugin-fusionauth-oidc
As @julian mentioned - w/out a bit more debug, hard to say what is happening. It would be nice to know what module is logging the error:
2020-10-22T09:50:51.938Z [4567/4301] - error: /auth/fusionauth/callback