How to open a Facebook group for search engines?

Question

Google

Previously, it seems like not, but now many groups are quietly indexed by search engines.
Made a public group. But it does not help if you open it in a private tab, it asks for authorization.

Answer 1

So this FB asks for authorization, not a group. There's not much you can do here.

Answer 2

How much time has passed? The fact is that the indexing process takes some time.