Follow requests not accepted

@angus thank you for your support so far. Although the inbox/outbox URLs look OK now, following still does not work. I’ve tried following @kuba@forum.internet-czas-dzialac.pl from two different Mastodon instances, and it failed in both cases.

I’m getting this error when submitting a follow request for a regular user actor:

[Discourse Activity Pub] Failed to process https://mastodon.internet-czas-dzialac.pl/6bef64d0-c8ad-473c-85f6-d3fd190b5ebd: 
Activity is not supported for actor and object

activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `block in warn'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `block in dispatch'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `each'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `dispatch'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `warn'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/logger.rb:26:in `log'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/logger.rb:63:in `warn'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/object.rb:140:in `process_failed'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:139:in `process_actor_and_object'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:56:in `process_activity'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:36:in `block in perform_transactions'
activerecord-7.2.2.1/lib/active_record/connection_adapters/abstract/transaction.rb:616:in `block in within_new_transaction'
activesupport-7.2.2.1/lib/active_support/concurrency/null_lock.rb:9:in `synchronize'
activerecord-7.2.2.1/lib/active_record/connection_adapters/abstract/transaction.rb:613:in `within_new_transaction'
activerecord-7.2.2.1/lib/active_record/connection_adapters/abstract/database_statements.rb:361:in `transaction'
activerecord-7.2.2.1/lib/active_record/transactions.rb:234:in `block in transaction'
activerecord-7.2.2.1/lib/active_record/connection_adapters/abstract/connection_pool.rb:421:in `with_connection'
activerecord-7.2.2.1/lib/active_record/connection_handling.rb:296:in `with_connection'
activerecord-7.2.2.1/lib/active_record/transactions.rb:233:in `transaction'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:34:in `perform_transactions'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:26:in `process'
/var/www/discourse/plugins/discourse-activity-pub/app/jobs/discourse_activity_pub_process.rb:14:in `block in execute'
/var/www/discourse/lib/distributed_mutex.rb:53:in `block in synchronize'
(...)

And this when udoing a follow request:

[Discourse Activity Pub] Failed to process https://mastodon.internet-czas-dzialac.pl/users/icd#follows/5003/undo: 
Object is not ready

activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `block in warn'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `block in dispatch'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `each'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:231:in `dispatch'
activesupport-7.2.2.1/lib/active_support/broadcast_logger.rb:130:in `warn'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/logger.rb:26:in `log'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/logger.rb:63:in `warn'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/object.rb:140:in `process_failed'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:137:in `process_actor_and_object'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:56:in `process_activity'
/var/www/discourse/plugins/discourse-activity-pub/lib/discourse_activity_pub/ap/activity.rb:36:in `block in perform_transactions'
activerecord-7.2.2.1/lib/active_record/connection_adapters/abstract/transaction.rb:616:in `block in within_new_transaction'
(...)