Microsoft Office 365 articles, fixes and updates - May 2020

This list contains all of the known Microsoft Knowledge Base articles, howtos, fixes, hotfixes, webcasts and updates of Microsoft Office 365 that have been released in May 2020. The list is daily updated.

• 4465277 Microsoft Teams is now the primary client for meetings and calling in Office 365 Q4465277 KB4465277 May 31, 2020
• 3209493 "To assign a license that contains Outlook Customer Manager ..." error when creating a new user in Office 365 Q3209493 KB3209493 May 31, 2020
• 3205457 You can't access a shared calendar by using Outlook for a hidden mailbox Q3205457 KB3205457 May 31, 2020
• 2988408 "Error: 80070005" when you run the Azure Active Directory Sync Services config wizard Q2988408 KB2988408 May 31, 2020
• 2964920 Hybrid Configuration Wizard fails to display digital certificates during hybrid deployment setup Q2964920 KB2964920 May 31, 2020
• 2964373 "Could not load file or assembly" error when you run DirSyncConfigShell.psc1 in Windows Server 2008 R2 Q2964373 KB2964373 May 31, 2020
• 2951074 You don't receive any confirmation after you successfully schedule a meeting or an appointment for an on-premises room mailbox in either Outlook client or Outlook Web App in Office 365 Q2951074 KB2951074 May 31, 2020
• 2934901 "HTTP 500" error when a user tries to publish the calendar of a shared mailbox in Office 365 Q2934901 KB2934901 May 31, 2020
• 2922668 "Data in the command exceeded the maximum permitted by the session configuration" error when you run the Get-Mailbox -ResultSize Unlimited command in Exchange Online Q2922668 KB2922668 May 31, 2020
• 2888788 Mail flow to Exchange Online stops, and event ID 2004 is logged on the hybrid transport server Q2888788 KB2888788 May 31, 2020
• 2879262 Missing certificate on the last page of the Hybrid Configuration Wizard Q2879262 KB2879262 May 31, 2020
• 2871040 Microsoft Exchange Online Message Trace Diagnostic Q2871040 KB2871040 May 31, 2020
• 2866165 Senders don't receive Out of Office notifications from an Office 365 user when Forwarding is enabled Q2866165 KB2866165 May 31, 2020
• 2853316 Separate passwords required for the computer and work or school account when using password synchronization and the Azure Active Directory sync tool Q2853316 KB2853316 May 31, 2020
• 2845956 "Mailboxes listed in the following table can't be migrated" error when you perform a staged Exchange migration to migrate on-premises mailboxes to Exchange Online Q2845956 KB2845956 May 31, 2020
• 2819692 How to troubleshoot Skype for Business Online sign-in issues with Lync Phone Edition devices Q2819692 KB2819692 May 31, 2020
• 2813640 The owner of a mail-enabled security group or distribution group can't manage the group if it's hidden from the GAL Q2813640 KB2813640 May 31, 2020
• 2813304 How to manage a mailbox in the on-premises environment when an Office 365 mailbox exists but an on-premises mail-enabled user doesn't exist Q2813304 KB2813304 May 31, 2020
• 2810692 "Federation certificate with the thumbprint cannot be found" error when you try to set up the federation trust to use the next certificate in Office 365 Q2810692 KB2810692 May 31, 2020
• 2804607 The Read status of email messages may not be updated between Exchange ActiveSync on a user's mobile device and the user's mailbox in Exchange Online Q2804607 KB2804607 May 31, 2020
• 2795329 How to block a message from being sent or received based on the file name extension of the attachment in Office 365 Q2795329 KB2795329 May 31, 2020
• 2795303 How to disable Exchange ActiveSync for users in Office 365 Q2795303 KB2795303 May 31, 2020
• 2791863 How to use Outlook Web App to remotely wipe an ActiveSync device in Office 365 Q2791863 KB2791863 May 31, 2020
• 2773628 "FederationInformation could not be received" and "405 Method Not Allowed" errors in a hybrid deployment of Office 365 and your on-premises environment Q2773628 KB2773628 May 31, 2020
• 2773530 Users can't sign in to Lync Mobile on Apple iOS-based devices because of certificate errors Q2773530 KB2773530 May 31, 2020
• 2772596 Error when you run the Hybrid Configuration wizard: "Updating hybrid configuration failed with error 'Subtask CheckPrereqs execution failed: Check Prerequisites'" Q2772596 KB2772596 May 31, 2020
• 2750145 Email messages sent from Office 365 users in a hybrid deployment are rejected, and nondelivery reports are received Q2750145 KB2750145 May 31, 2020
• 2710846 Error message when you run the Get-FederationInformation cmdlet in Office 365: "An unexpected error has occurred and a Watson dump is being generated" Q2710846 KB2710846 May 31, 2020
• 2667844 User can't view free/busy information for a remote user in a hybrid deployment of on-premises Exchange Server and Exchange Online in Office 365 Q2667844 KB2667844 May 31, 2020
• 2663556 Email messages that are sent from the on-premises environment to Office 365 show email addresses instead of display names in the From field Q2663556 KB2663556 May 31, 2020
• 2626696 "Exception has been thrown by the target" error in a hybrid deployment of Office 365 and your on-premises environment Q2626696 KB2626696 May 31, 2020
• 2619308 How to troubleshoot deleted user accounts in Office 365, Azure, and Intune Q2619308 KB2619308 May 31, 2020
• 2584294 Error when you try to migrate a user's mailbox data from the on-premises environment to Office 365: "This mailbox exceeded the maximum number of large items that were specified for this request." Q2584294 KB2584294 May 31, 2020
• 2570535 How to troubleshoot Windows PowerShell issues that affect Exchange Online for Office 365 Q2570535 KB2570535 May 31, 2020
• 2531068 "Lync cannot verify that the server is trusted for your sign-in address." message when you sign in to Lync 2010 by authenticating to Skype for Business Online Q2531068 KB2531068 May 31, 2020
• 2506626 Outlook Web App opens in the light version when it's used in Office 365 even though the user has a supported web browser Q2506626 KB2506626 May 31, 2020
• 2427193 A mobile device can't connect to Exchange Online by using Exchange ActiveSync Q2427193 KB2427193 May 31, 2020
• 2332495 Outlook can't connect through a proxy that's set up by using a file://–based PAC file Q2332495 KB2332495 May 31, 2020
• 2293282 Calendar on mobile device isn't synced to the calendar in an Exchange Online mailbox when you use Exchange ActiveSync Q2293282 KB2293282 May 31, 2020
• 10092 Troubleshooting free/busy issues in Exchange hybrid environment Q10092 KB10092 May 31, 2020