Feed security
Every poll is re-checked against the subscriber's live Confluence permission on the calendar. A genuine loss of access (deactivated user, revoked grant, deleted calendar) permanently revokes the link and the feed answers "no longer available"; a temporary failure answers a retry status and does not revoke. Uninstalling the app revokes every feed token in the site and deletes the cached feed bodies.
#Related
How it actually behaves.
