I have the exact same issue here, on console have the following issue:
Error parsing plugins : Hostname/IP doesn't match certificate's altnames: "Host: . is not in the cert's altnames: DNS:[domain].com, DNS:www.[domain].com"
The developer appears to be active. You should open a new issue on their github if you are having problems.
https://github.com/Antergos/nodebb-plugin-sso-auth0/issues