Link validation requires the coordination between the Mastodon and and the link URL. Use this
tool to see what issues might be preventing a link from being verified.
Note: This link is verified but not currently passing all checks. It might not
reverify next time the profile is saved and might appear unverified on some instances.
Is the link HTTPS?
Did the link response succeed?
Is the link response less than five seconds?
Is the link less than 1MB?
Is there a link back to the profile?
Is there a link back to the profile with a rel=me attribute?