TIL I needed to opt-in to an allow-list of domains for `fediverse:creator` on my profile (in addition to the `<meta>` tag on my web site)
Edit Profile -> Verification (tab) -> Author attribution (section) -> Websites allowed to credit you (textarea)
Read more about fediverse:creator here: https://blog.joinmastodon.org/2024/07/highlighting-journalism-on-mastodon/