Welcome! This forum has a treasure trove of great info – Scouters helping Scouters! Just a heads up, though - all content, information, and opinions shared on this forum are those of the author, not the BSA.
So I just went back and checked. All the ones in ScoutBook Den Leader are missing that end part. They are all incorrect. Looks like the reason my Pack calendar is working is because I was able to grab the link out of the Admin version. My Bear Den however does not show as an available calendar to choose in the Admin view.