Friendica federation: 400 while accessing inbox?

Still trying to follow micro.blog users from Friendica via ActivityPub, I’m discussing with one of the Friendica devs and learnt:

" I just tried to follow your account and got this: Transmit to https://micro.blog/activitypub/z428/inbox returned 400 . “400” is an error code. Can you check on the other side, why they don’t accept our request?"

@manton Any idea…?

Thanks, I’ve commented over there and I’m trying to figure out how to best test this.

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Seen, thanks bunches. :slight_smile: