Reservations show as Private Appointment on Calendar

[Terri54]

Whenever I book a trip for my executive, afterwards it shows up as "Private Appointment" on his Outlook calendar.  He shares his calendar with me, and it shows up normally on mine, with all the reservation details, flights, etc., but not on his.  Is there a way to fix this?  

[KevinD]

@Terri54 here you go: 

Users will need to follow the steps below to modify their calendar options:

1. Log onto the web version of Outlook 365
2. Go to Settings (gear icon)
3. Go to Calendar > Events from email

Two options will appear:
Don’t add events to my calendar from email
Automatically add events to my calendar from email.

1. Uncheck the box of ‘Mark events as private so only I can see them'. (if they want to unhide and share the calendar even to other employee). 
2. Select Save

Cause

Additional Information	Tip: To find your Outlook on the web address, choose File. On the Info tab under Account Settings, the address is shown under Access this account on the web. Note: If the instructions don't match what you see, you might be using an older version of Outlook on the web. Try the Instructions for classic Outlook on the web.