[Google Calendar - MS Teams Meeting] Cant add Cohosts

Hi @Tan, 

Thank you for posting your question in the Microsoft Q&A forum.                  

I understand that you’re unable to select co-organizers for your Microsoft Teams meeting, as the “Choose co-organizers” option is locked. To better understand the situation and provide you with the most accurate guidance, I’d like to ask a few clarifying questions: 

• How was the Microsoft Teams meeting added to the Google Calendar event? 
• Did you add the Teams meeting directly from Google Calendar, or did you create a new meeting separately in Microsoft Teams based on the existing Google Calendar event? 
• If the Teams meeting was added through Google Calendar, could you please share the steps you followed? This will help me reproduce the scenario on my end. 
• Additionally, if you create a brand-new meeting directly in Microsoft Teams (not linked to Google Calendar), are you able to assign co-organizers there without any issues? 
• When you attempt to add a co‑organizer, is the option completely grayed out, or do you see any error or notification message? 
• If possible, please provide a screenshot of the Meeting options page where the co‑organizer setting is unavailable (feel free to obscure or remove any sensitive or personal information). 

Thank you again for your time and understanding. While my initial response may not resolve the issue immediately, I’d like to gather more details about your situation so I can assist you more effectively.               

I really appreciate your patience, and I’m here to help. Looking forward to your response.          

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread       

The co-organizer (cohost) dropdown in Teams meeting options is only available when certain conditions are met. In this scenario, the most likely reasons it appears locked or unavailable are:

1. The meeting organizer role cannot be changed
   • Only the original meeting organizer can assign co-organizers.
   • If the event was inherited or re-created from Google Calendar, ensure the current signed-in account is the actual organizer of the Teams meeting. If not, the co-organizer control will not be editable.
2. Co-organizers must be in the same organization
   • Only people in the same organization (or guests in that org) can be made co-organizers.
   • External participants (from other organizations) cannot be set as co-organizers, so they will not appear as valid selections and the feature may appear unavailable for those attendees.
3. How to correctly add co-organizers Once the meeting is owned by the correct organizer and attendees are in the same org:
   1. In Teams, go to Calendar.
   2. Select the event and choose View event.
   3. Make sure the people to be co-organizers are added as required attendees.
   4. Select Options.
   5. Under Roles > Choose co-organizers, search and select the attendees to promote.
   6. Select Apply (or Save in the roles dialog).
4. Limitations to be aware of
   • Up to 10 co-organizers can be added.
   • Co-organizers must be invited to the meeting to appear in the dropdown.
   • Co-organizers cannot change the meeting before it starts, and the organizer role itself cannot be reassigned.
   • External participants cannot be made co-organizers.

If the meeting was created via the Google Calendar add-on and the organizer is different from the Teams account being used, recreate the meeting from the correct organizer account in Teams, then re-add the Teams meeting link to the Google event and configure co-organizers from Teams.

References:

• Add co-organizers to a meeting in Microsoft Teams
• Roles in Microsoft Teams meetings
• Schedule a Microsoft Teams meeting from Google calendar