I’ll chime in too.
I wonder if how long it should take for the profile header to show up in Mastodon (the one that can be set at https://micro.blog/account/mastodon)? I aliased my previous Mastodon account to point to my ActivityPub name @juha@juhaliikala.com and updated the header image too at that point. But some hours later, the header image was still showing as the “old one”. I tried to upload a new one after that a few times, but it doesn’t seem to get updated. Not sure how long that usually takes? Any pointers @manton? 
Oh, and another related thing. Is there a way to verify the Blog URL that shows up in Mastodon for the profile?