Using invite-users branch on the server, and master on the client
Following appearing in server log:
UnhandledPromiseRejectionWarning: FetchError: request to http://login.hawth.org:9011/oauth2/introspect failed, reason: connect ETIMEDOUT 206.81.14.41:9011
Appears something is attempting to hit https://login.hawth.org at port 9011, which is invalid.