Enable External User to Book Meeting Room in O365
First of all you will have to Set up organizational relationships. 1. Set up organizational relationships. Ø In the admin portal of Organization A: set up an organizational relationship with domain of Organization B. o Login to exchange admin center. o Click on organization. o Click on sharing. o Click on + sign below to organization. o Create a organization relationship there and save the changes. o Do it again in the other domain. o In the admin portal of Organization B: set up an organizational relationship with domain of Organization A. Ø Reference: https://docs.microsoft.com/en-us/archive/blogs/ehlro/enable-freebusy-information-between-the-office-365-users-from-two-different-tenants-when-the-autodiscover-of-one-of-them-is-pointing-on-premise 2. Run PowerShell so external user able to book the meeting room. Ø Open Exchange On...