Would it be possible for me to make comments to other instances etc?
Solved: I can’t, it would only work with a public domain.
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I don’t know enough about ActivityPub to say for sure but I believe that in order to federate properly (grab posts and comments from other servers as well as sending posts and comments to other servers) you need to have a publicly accessible domain with SSL. Hosting on localhost ( the computer you want to access from) is pointless if you don’t have a reverse proxy set up to actually let others see your server online.