You can try unsubscribing and resubscribing. The switch to “subscribed” from “subscription pending” depends on the remote server sending you an activity acknowledging the subscription. New instances sometimes struggle initially, because the remote instance has to discover you first and I think there’s a race condition where it won’t send the activity because it doesn’t know if your instance is up yet. (There’s an instance sync job that runs periodically to ping all linked instances, and it pauses sending activity to instances that are not considered active. If your subscription is the first interaction, you’re not “active” yet as it just learned about your instance)