It is recommended to full Directory Sync all Active Directory users and leave this flag as the default False.Īfter you enable AutodiscoverPartialDirSync, it will take approximately 3 hours to fully saturate across the cloud.įor instructions using PowerShell see this topic, Connect to Exchange Online PowerShell. Online email addresses will be susceptible to enumeration. Setting this flag to true will cause unknown users to be redirected to the on-premises endpoint and will allow on-premises users to discover their mailbox automatically. The AutodiscoverPartialDirSync option is for scenarios where tenants have Directory Synced some of their Active Directory users into the cloud, but still have on-premises Exchange users that are not Directory Synced. Sign out all Office.Removing all the stored credentials in the credentials manager (Control Panel > User Accounts > Credential Manager > Windows. The second thing would be to create a new Outlook Profile, add the account to it and see if it behaves. This parameter is available only in the cloud-based service. The first thing to try is to remove and re-add the email account. Use the PowerShell AutodiscoverPartialDirSync option when your tenant has Directory Synced some of your Active Directory users into the cloud, but you still have on-premises Exchange users that are not Directory Synced. Learn more at Azure AD Connect User Sign-on options.Ģ. We could manage the list from Microsoft Account website to check if memory serves correctly. Also please check whether we have reached the maximum 10 devices verified to a Microsoft Account. Sync all your mailboxes to Office 365 as mail users so they are known hybrid users and get redirected back to on premises.įor more information see these reference materials:Įxchange hybrid deployment considerations which links out to this more specifically on AzureAD connect for syncing: Azure AD Connect sync: Understand and customize synchronizationĪctive Directory Synchronization is also listed as a pre-requisite for Exchange Hybrid: Hybrid deployment prerequisitesĪctive Directory synchronization: Deploy the Azure Active Directory Connect tool to enable Active Directory synchronization with your on-premises organization. To remove stored credentials and force Outlook to use your Windows desktop credentials, follow these steps: Click Start, click Control Panel, and then click Credential Manager. Go in to Settings and in the Accounts area there should be a link to verify your Microsoft Account to your device. This issue occurs if the Office 365 tenant has at least one mailbox in the cloud.īelow are the two main options to resolve the issue:ġ. On premise customers with the Office 365 client began seeing unexpected credential prompts in Outlook for Windows starting on or after November 11th.
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