(Updated) [Reminder] Microsoft Teams Premium Self-Service Trials (Originally announced in MC670435)
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Services
Microsoft Teams
Updated March 25, 2026: We have updated the content. Thank you for your patience. [Introduction] We are resurfacing MC670435, published September 2023 to remind admins of the Microsoft Teams Premium self-service trial capability. This message serves as a reminder as we begin a broader rollout of the feature announced in 2023. As we expand rollout and introduce additional entry points for this feature, we want to ensure continued awareness and readiness. [When this will happen:] Ongoing rollout. [How this will affect your organization:] When rolled out, users within your organization will be able to directly initiate a Teams Premium trial. These self-service trial licenses will be a part of your Microsoft organizational tenant, and you will be able to manage these licenses like other Microsoft subscriptions. You will be able to cancel these trial licenses at any time. If you choose to dis
preventOrFixIssuenormalMC1258087
Take Action: Out-of-band update released to address an issue signing in to apps with a Microsoft account
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Services
Windows
Microsoft has identified an issue affecting signing in to apps using a Microsoft account. After installing the March 2026 Windows security update, some users might be unable to sign in to Microsoft apps and services. During sign‑in, users might see a “no internet” error even when the device has a working internet connection. This issue affects only Microsoft account sign‑in scenarios; organizations using Microsoft Entra ID for app authentication are not affected. An out-of-band (OOB) update was released today, March 21, 2026, to address this issue. This cumulative update includes all protections and improvements from the March 2026 Windows security update released March 10, 2026. This OOB update is available for Windows 11, versions 25H2 and 24H2 devices that receive standard Windows updates. It can be installed through Windows Update or the Microsoft Update Catalog. For more information
preventOrFixIssuehighMC1257217
Action Required: Update active Exchange Web Services Applications
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Services
Exchange Online
In 2018, we announced that we were no longer making feature updates to Exchange Web Services (EWS) in Exchange Online, and we advised developers to move to Microsoft Graph. In September 2023, we announced that on October 1, 2026, we will start blocking EWS requests to Exchange Online. We are now less than 12 months from October 1, 2026. We have made progress on closing most parity gaps with more changes in development to be released in the coming quarters. Please refer to Deprecation of Exchange Web Services in Exchange Online for up-to-date guidance and roadmap information. You are receiving this notification because there are EWS applications in your tenant. If you haven't already, start the process of working with your application development organization and your application vendors to either sunset or migrate active EWS applications on your tenant to the Graph API, Power Platform, o
preventOrFixIssuenormalMC1254512
(Updated) Second deployment phase for Kerberos RC4 hardening begins with the April 2026 Windows security update
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Services
Windows
Updated March 20, 2026: Added additional guidance for devices using Azure Files SMB with Active Directory–based authentication and Azure Virtual Desktop. Windows updates released April 2026 and later introduce the second deployment phase of protections for a Kerberos information disclosure vulnerability (CVE‑2026‑20833). In this phase, domain controllers change default Kerberos ticket behavior for accounts that do not have an explicit Kerberos encryption configuration, shifting to AES‑SHA1-only by default. Environments with remaining RC4 dependencies may experience authentication issues unless those dependencies are remediated or explicitly configured. When this will happen:April 2026 - Enforcement Phase with manual rollback: Default Kerberos behavior changes so domain controllers use AES‑SHA1-only encryption for accounts without explicit encryption type settings, and Enforcement mode is
planForChangenormalMC1253752
Microsoft Teams: Manage multiple phone numbers within one Teams account
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Services
Microsoft Teams
[Introduction] Teams Phone user multi-line provides greater flexibility for organizations whose users manage multiple business numbers. This capability allows administrators to assign up to 10 telephone numbers to a single Teams Phone user, all within one Teams account. Users can make and receive calls from multiple numbers across Teams desktop, Teams mobile, and Teams devices without switching accounts or hardware. This enhancement supports a familiar and localized calling experience for users who work across regions, roles, or business lines. This capability supports scenarios such as: Establishing local presence across multiple regions Supporting users with multiple roles or responsibilities Allowing executives, assistants, or support teams to manage multiple business lines within one Teams account This message applies to Teams for Windows desktop, Teams for Mac desktop, and Teams for
stayInformednormalMC1253720
Out-of-band hotpatch update released to address an issue affecting Bluetooth device visibility
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Services
Windows
Microsoft has identified an issue affecting hotpatch-enabled Enterprise editions of Windows where Bluetooth devices may not appear on the Bluetooth & devices page in Windows Settings or in Quick Settings, even though the devices are connected and functioning as expected. In addition, users might be unable to add Bluetooth devices because available devices do not appear in the connection list. This issue was identified in Microsoft’s internal environment and is expected to affect a limited set of Enterprise devices running Windows hotpatch updates. An out-of-band (OOB) hotpatch update (KB5084897) was released today, March 16, 2026, to address this issue. This cumulative update includes all protections and improvements from the March 2026 Windows hotpatch updates released on March 10 and March 13, 2026. This OOB hotpatch update is offered only to hotpatch‑enabled Windows 11, versions 25H2