Calendars aren't available to be added to Team Calendar

[Noah B]

My team created unique pages with a calendar for each person in our team and then added these to Team Calendar macro.  This was to allow users to add their availability to multiple team calendars without sharing from their personal space. 

This works for most users but occasionally someone's calendar cannot be added and will not show up in the Edit 'Teams Calendars' Macro dialog.  The calendar is visible in the list of all calendars in our space.  

This issue hasn't been consistent.  It has occurred 5-6 times.  Deleting the calendar and remaking it has solved issue in some but not all cases.  Any advice how to troubleshoot or resolve?

[Brant Schroeder]

@Noah B When this occurs have you tried to rebuild your content index to see if it resolves the issue?