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Generally, there are three types of certificate errors, and the reasons for each type of error are different. For migrated mailbox, autodiscover service will redirect On-premise autodiscover record to Office 365 ( ), and access to Office 365.Ģ.Regarding the certificate error. For On-premise mailbox, it remain use previous autodiscover lookup behavior to find endpoint and access to Exchange. We need point autodiscover record to On-premise Exchange server. Get-ClientAccessService | Set-ClientAccessService -AutoDiscoverServiceInternalUri $Nullįor more information, please refer to the scenario two in this article: How and when to decommission your on-premises Exchange servers in a hybrid deploymentĢ)If there are mailboxes located on the on-premises Exchange server. And run the following command to remove the Servcie Connection Point(SCP) values on your Exchange servers. You could set up the Autodiscover DNS records point to Exchange online instead of to on-premises. It depends on the location of your mailbox.ġ)If all mailboxes has been migrated to Exchange online. If the above suggestion helps, please click on "Accept Answer" and upvote it.ġ.Agree with above. In Exchange hybrid environment, we need point autodiscover record to On-premise Exchange server.įor On-premise mailbox, it remain use previous autodiscover lookup behavior to find endpoint and access to Exchange.įor migrated mailbox, autodiscover service will redirect On-premise autodiscover record to Office 365 ( ), and access to Office 365. Also, for external client prompt, possibility could be that the certificate can be fetched from any of the network devices in between like load balancer, etc This should be set on the AutoDiscoverServiceInternalUri value on the Get-ClientAccessServer which is the Autodiscover SCP for internal clients.įor the certificate prompt while connecting through outlook, please share the screenshot by covering your personal information to provide the suggestions as this can be of various reasons like certificate is not binded correctly in IIS, virtual directories are not configured with the URL matching the certificate, certificate validity, etc. Usually, we will also create internal DNS record with and point to the load balancer if there are multiple servers for high availability.