@Gargron apologies, this is not the best way to get my point across.

I have an example in this ticket: github.com/mastodon/mastodon/i
Basically a frontend to an activitypub service enables webfinger (to accomodate Mastodon and other services that use it for actor discovery), but the actors themselves belong to a different service (IRIs on a different domain) which doesn't expose webfinger.

The discussion in the ticket seems to have gotten off track into a different direction that I'm unclear on. 1/2