Office 365 Calendar. Struggling with sharing meeting title or details with a room or resource

Hi Coppo23,

you're encountering a common problem with Office 365 room calendars where the default setting displays the organizer's name instead of the meeting subject. 
By default, the room mailbox’s calendar shows the organizer’s name instead of the subject because AddOrganizerToSubject and DeleteSubject are set to True.

To change this behavior, you can use PowerShell commands.
Here are the steps:

1. Open Windows PowerShell and connect to Exchange Online PowerShell using a Microsoft 365 admin account.
2. Run the following PowerShell command to set the values of AddOrganizerToSubject and DeleteSubject to False:

Set-CalendarProcessing -Identity <RESOURCEMAILBOX> -DeleteSubject $False -AddOrganizerToSubject $False

Make sure to replace <RESOURCEMAILBOX> with the email address of your room mailbox.

This change will affect new meeting requests, allowing the room calendar to show the meeting subject instead of the organizer's name.

Office 365 Calendar room event title - Microsoft Community

If you're still facing issues, there's a script available for download that might assist.
How to Fix Titles for Meeting Room Calendars in Office 365 & Exchange | Robin (robinpowered.com)

After downloading, unzip the file and run update_o365_room.bat as an administrator. Enter your Office365 credentials when prompted, and the script will automatically update your meetings to use the event name.