Subscription to discussion "Spanish from German" https://www.duolingo.com/topic/916 not possible?
Doesn't seem to be listed in the options when I go to edit my subscriptions ...
When you click on the subscription list, you'll see the list of forums available from your native language, or rather from whatever Duolingo currently thinks your native language is.
You'll need to tell Duolingo your native language is German. Switch to the Spanish from German course, and you'll be able to subscribe to the forum.