$config_base_url is not set in config.php.
Without it there is no address to build a subscription link from. Set it to the hostname this install is reached on and reopen this.
Sharing = escapeHtml($calendar['calendar_name']) ?> makes a secret link that Google Calendar, Outlook, an iPhone, Nextcloud or Thunderbird can subscribe to - a client's maintenance windows in their own calendar, or the team's onsite visits on a wall screen.
Anyone with the link can read this calendar without signing in. Share it like a password; a new link can be made here if it gets out.
Made = $calendar['calendar_feed_created_at'] ? escapeHtml(date('M j, Y', strtotime($calendar['calendar_feed_created_at']))) : '' ?> ·
= $calendar['calendar_feed_accessed_at'] ? 'last fetched ' . escapeHtml(timeAgo($calendar['calendar_feed_accessed_at'])) : 'not fetched by a calendar yet' ?>
>
Subscribing