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I believe I know what was causing my issue – it seems to be the hyphens in the subdomain name. I switched to a new subdomain visionary.davidjmiller.org and when I post there everything is working.
Also, in case it helps anyone, early in the process of trying to set things up I thought that the plugin was failing to handle follow requests. I eventually discovered that follow requests made through the Mastodon app I use, Tusky, would result in a “Follow requested” status but that follow requests made directly through the web interface for Mastodon worked just fine (including being able to see the follow and posts in Tusky).