Solicitações de seguidor não aceitas

@angus obrigado pelo seu apoio até agora. Embora os URLs de entrada/saída pareçam estar corretos agora, o seguir ainda não funciona. Tentei seguir @kuba@forum.internet-czas-dzialac.pl de duas instâncias diferentes do Mastodon e falhou em ambos os casos.

Estou recebendo este erro ao enviar uma solicitação de seguir para um ator de usuário regular:

[Discourse Activity Pub] Falha ao processar https://mastodon.internet-czas-dzialac.pl/6bef64d0-c8ad-473c-85f6-d3fd190b5ebd:
Atividade não é suportada para ator e objeto

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'
(...)\n```

E este ao desfazer uma solicitação de seguir:

[Discourse Activity Pub] Falha ao processar Internet. Czas działać! 🌎 (@icd@mastodon.internet-czas-dzialac.pl) - Fundacja Internet. Czas działać! - serwer Mastodona
Objeto não está pronto

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’
(…)\n```