I figured it out I think! The problem was that the link basically opened in a browser, and the browser has no idea what my Lemmy.world login is. My Lemmy App (Connect) has a search bar on the left side where I had to enter the community name and choose the right instance. IE there were 3 different Anarchychess communities with the same name, but the Sopuli instance was the “right” one. Going to the page trough the search bar allowed me to subscribe like I wanted.

Might be a stupid question, but I iust signed up for lemmy.world today and wanted to add some communities from the migration list here. The equivalent of r/anarchychess is listed as https://sopuli.xyz/c/anarchychess and on my first visit to that site I couldn’t really figure out how to subscribe… in this case sopuli would be the hosting instance if I understand. Do I need a sopuli account to subscribe and just add that account to my lemmy app? Or did I just not find the right option?