Forum Discussion
Problem with Teams and Exchange Integration
Hi everyone,
My goal is to integrate Exchange Server (Exchange 2016 CU23) with Teams so that the Teams calendar can be used. I have set up Hybrid Configuration (Classic Full Hybrid) and completed the setup without any errors. I have also checked Entourage, and it shows that Exchange has been registered, but the Teams calendar is still not working.
Check items:
1. Get-AuthServer
2. Get-IntraOrganizationConnector → Confirm the "Enabled" status.
3. Get-PartnerApplication → Confirm it's enabled.
4. External resolution of the Autodiscover and EWS virtual directories
5. Run Teams Exchange Integration → The only thing that works is "Verifying if the user's mailbox is discoverable by the Teams service," and everything else is fine.The user's mailbox is not discoverable by the Teams service. Please ask your administrators to verify the user has a mailbox and to confirm the connectivity between Teams and Exchange.
Does anyone have any other ideas or suggestions to help me? Thanks!
2 Replies
Hi,
you could check these, too:1. Enable EWS at the Organization Level
Microsoft recently changed the behavior: Organization-level settings override user-level settings for EWS.
PowerShell Commands:
PowerShellGet-OrganizationConfig | fl EwsEnabledSet-OrganizationConfig -EwsEnabled $true2. SSL Certificate Warning
An invalid or misconfigured SSL certificate can block communication between Teams and Exchange—especially for Autodiscover and EWS.
Check:
PowerShellGet-ExchangeCertificate | fl Issuer,CertificateDomainsShow more lines
Requirements:
Get-ExchangeCertificate | fl Issuer,CertificateDomains
SANs must include:
- mail.domain.com
- autodiscover.domain.com
CN (Common Name) must match the hostname.
No SSL offloading on the load balancer—SSL must terminate at the Exchange server.3. Ensure External Autodiscover and EWS Are Reachable
Teams uses Autodiscover V2, which relies on Exchange Online redirecting to your on-premises server.
Test URLs:
https://autodiscover.domain.com/autodiscover/autodiscover.json
https://mail.domain.com/ews/exchange.asmx4. Additional Checks
Get-AuthServer → Ensure OAuth is properly configured
Azure AD Connect: User must be synced
No SSL cipher suite mismatches (check load balancer settings)Thank you for the reply.
I have tested items 1 to 4 mentioned above, and they are all working correctly and enabled. However, the final error that occurs with my Teams and Exchange integration is as shown in the image in my previous question — Teams is unable to discover the users' mailboxes in Exchange, which results in the Teams calendar not functioning.
