I noticed that some instances put a registration wall behind their communities. If you are registered in instance A, you can search for a specific community in instance B but cannot see the full list of communities there. Is there a workaround (besides asking someone from B to give a list of the instance)?
You should be able to see the community list even when not logged in by visiting their instance and clicking Communities -> Local, unless they’ve somehow blocked that. (For instance, if I go to lemmy.ml and click Communities, I can see plenty of communities that don’t show up under the ‘All’ communities list on my local instance.)