Hi David,
This doesn't seem to be working for me. I have set the Options page for single-author usage on MichaelMcCallister.com (years ago). Where would I see the rel-me link on the home page?

FWIW, Mastodon asks us to copy this text to the site to verify:

Mastodon.

I've tried editing my SemPress theme header and footer with the above code, but that doesn't seem to work either.

Anything else to try?