@dave Sorry, I think I was wrong about the instance actor. Mitra discovers actor by analyzing the keyId parameter in Signature HTTP header. If the value of this parameter contained URL with a query such as ?id=920666, it was removed, so only https://ap.podcastindex.org/podcasts remained.
I explained that in a subsequent reply:
https://mitra.social/objects/018d1433-67e4-028f-79b8-7ced5a7bad0c
The address of public.mitra.social instance actor is http://public.mitra.social/actor
@dave On Mitra side I see incoming Accept activity, but the server can't retrieve the public key:
HTTP status client error (400 Bad Request) for url (https://ap.podcastindex.org/podcasts)This is probably your instance actor. I tried to send a request manually, it still returns 400 Bad Request
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