Relay actor doesn't have "outbox" property
The outbox property is required by ActivityPub standard: https://www.w3.org/TR/activitypub/#actor-objects (the collection can be empty).
Example: https://relay.21314.de/actor
The outbox property is required by ActivityPub standard: https://www.w3.org/TR/activitypub/#actor-objects (the collection can be empty).
Example: https://relay.21314.de/actor