I'm modifying my services so they are all running behind a reverse proxy (traefik). I also added OAuth which is really useful, but how can I add my services in nzb360? When I just enable basic auth it works.
Are you running Traefik in Docker?

Which Oauth system are you running?

If so, I can give you my workaround using Traefik and Authelia which makes any API calls using the API key bypass oauth, but any logins still go through oauth itself.

If you are using basic http auth, you can put the URL as: https://username:password@sonarr.mydomain.com (as an example) and it'll obfuscate the username + password entries.