Hydra and Dex both support OAuth and OpenID Connect. This apparently supports neither, but comes with its own JWT structure.
With inbound federation that shouldn't be much of a problem, but with outbound federation you'll have some very difficult questions to answer (especially because all major identity solutions are pretty much OIC centric these days)
With inbound federation that shouldn't be much of a problem, but with outbound federation you'll have some very difficult questions to answer (especially because all major identity solutions are pretty much OIC centric these days)