Currently, On-premise users can check a schedule of cloud user.
However, they can check a schedule but cannnot check a detail schedule even if cloud user permits to check detail schedule to everyone.
So if On-premise user adds a calendar of cloud user and check it, then the following message is displayed and cannot detail a schedule.
"No details available"
This behavior is very inconvenience.
So On-premise user should be able to check a detail schedule of cloud users.