How to share calendar information between different 365 tenants

Question

Hello,

I am the admin of two different 365 tenants.

In one tenant (Tenant A), we have 2 room resources. I would like to be able to see those resources and their calendar information to book them from Tenant B.

I came across this guide to create an "organization relationship" between Tenant A and Tenant B: [Microsoft Documentation on Creating an Organization Relationship]

https://learn.microsoft.com/en-us/exchange/create-an-organization-relationship-exchange-2013-help#use-the-eac-to-create-an-organization-relationship

I followed those steps and established an organization relationship via the Exchange admin center "Organization Sharing" menu, but even after 12 hours, I cannot see any calendars/resources from Tenant A in Tenant B mailboxes.

What did I miss?

Answer 1

Organizational relationships do not allow you to see the mailboxes themselves, just their availability info. In other words, these room mailboxes will not appear in your GAL or anywhere else in Outlook/OWA. You have open the scheduling assistant and add the mailbox's email address therein, if the org relationship is configured correctly you will be able to see their availability.

Answer 2

Hi, @Dan

From your description, I understand that you didn't work long after you successfully set up organization sharing.

I could not agree more with Vasil Michev's idea. You will need to add resources in the Scheduling Assistant before you can see the calendars for other tenants, and you may only see partial availability. This is shown in the figure below.

In addition, you can check the following aspects:

1.Is the domain name entered correctly?

2.Are there restrictions on users' sharing permissions?

3.Network instability can sometimes have an impact on functionality as well.

4.After setting up an organization relationship, it may take a long time for the synchronization to complete due to the organization configuration. It is recommended to continue to monitor the feature.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".