Access via Reeder to self-hosted instance (with DNS redirection)

Hi all,

Is it possible to access a self-hosted instance via Reeder (or another app)?

I have set up my DNS server to direct newsblur.com to my local instance. The Reeder macOS app let’s me get as far as entering my username and password, but then I see Error: invalid_request Invalid client_id parameter value.. I gather this is a generic OAuth2 error message.

Cheers!