@feditips@cazzztle that’s always been a confusing bit for me. I had initially thought “federation” included SSO functionality, but that’s incorrect. It would be nice, especially with the various services popping up that are based on ActivityPub, but that’s not how any of this was designed.
@cazzztle @feditips fwiw, matrix (federated chat) does let you set mastodon as an SSO provider, but I haven’t a clue about other services.