@robb very kind of you!
The inbox controller is at
https://github.com/edent/location-activitypub-symfony/blob/main/www/src/Controller/InBox.php
@robb ah, I stuffed up the headers. Got them working now.
New error is "Verification failed for ..." Which at least is progress!
@Edent Excellent! (Was putting the kid to bed and only just started looking, glad you got it sorted)