On another Lemmy instance, I saw that I was not logged in but could subscribe by putting “!emulation@lemmy.ml” into the search field. However, when I put it into the search field of this Lemmy instance, it gives me a comment containing that string, but does not allow me to subscribe.
What is the correct way to do it?
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What you are doing is right, but it takes some time for your instance to set up the connection to the new community. Give it a few minutes, then search for the community by its plain name (e.g. emulation) under all.