On cross-tenant collaboration we can't see each other's availability
Free/busy between Microsoft 365 tenants needs an organisation relationship or cross-tenant access policy.
support/email-aflevering/free-busy-cross-tenantsteps: 4
Try this first
- In M365 admin: configure organisation relationship with the other tenant
- Set free/busy access scope (per user or whole tenant)
- Test by inviting someone from the other tenant to a meeting
- Allow up to 24 hours for replication
When to bring us in
For long-term collaboration, consider Entra ID guest users, free/busy then works natively.
See also
- Our emails land in spam for some recipientsAlmost always an SPF, DKIM, or DMARC setting that is wrong or missing, or a sender name that mimics a well-known brand.
- Someone reports receiving phishing emails "from us"Read: spoofing. Someone is abusing your sender name, not necessarily your actual mailbox.
- An email bounces (NDR): delivery failedThe NDR text usually states the exact reason. Reading it is step one.
None of the above fits?
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