mastodon.zunda.ninja is one of the many independent Mastodon servers you can use to participate in the fediverse.
Zundon is a single user instance as home of @zundan as well as a test bed for changes of the code.

Administered by:

Server stats:

1
active users

zunda

右上のメニュー - Settings - Advanced - Privacy and security - Current settings - NotificationsでBlockのリストからこのインスタンスのURLをRemove。このインスタンスをリロードするとShow notificationsと聞かれるので、Allow

at=info method=POST path="/api/web/push_subscriptions" host=mastodon.zunda.ninja status=200 bytes=1690 protocol=https
Rendered ActiveModel::Serializer::Null with Hash
method=POST path=/api/web/push_subscriptions format=html controller=Api::Web::PushSubscriptionsController action=create status=200

これで他のインスタンスからリプライを送ると、

method=POST path=/api/subscriptions/5098 format=html controller=Api::SubscriptionsController action=update status=200
[active_model_serializers] Rendered REST::NotificationSerializer with ActiveModelSerializers::Adapter::Attributes
[active_model_serializers] Rendered REST::StatusSerializer with ActiveModelSerializers::Adapter::Attributes
[active_model_serializers] Rendered REST::StatusSerializer with ActiveModelSerializers::Adapter::Attributes

たぶんこれで見えてる気がするなあ…。