External Sharing in SharePoint and OneDrive is changing: What You Need to Know

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In an ongoing effort to create a more secure environment by default, Microsoft is introducing an important security update that will affect how external users access content shared through SharePoint and OneDrive. Starting July 1, 2025, any links shared with external users before your organization enabled Microsoft Entra B2B integration will no longer work. This change applies to all organizations that have already enabled or will enable SharePoint and OneDrive integration with Microsoft Entra B2B (Most organizations I have looked into so far). External users trying to use old links will see an error message saying the organization has updated its guest access settings. To regain access, the content must be reshared. Highlights of how the change affects organizations who have enabled B2B: All external sharing will require guest registration. External users must be added as guests in your Microsoft Entra directory. Access will be managed through Microsoft Entra B2B Invitation Manager. T...

Prepare for shared channels in Teams

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According to a post in the message center not long ago, the shared channels feature in Teams is about to roll out in GA after being available in preview for some time.

Although shared channel seems to be available by default in the Teams client, please note that this is only an internal availability, unless the admin of the tenant has enabled/allowed the b2b-directconnect in Azure AD. 

I recommend reading up on this article in order to familiarize yourself with the configuration. It is not enabled by default, and there are several options available. A good approach could be by opening to specific partners and not allowing "everyone". If the company has invested in AAD P1 or P2 licenses, it is also possible to trust the partner's MFA and Compliance checks in conditional access, easing the usage for users.

This feature adds to the mix of external user access. It does not replace the guest user feature, nor anonymous access to teams meetings. But the real benefit of shared channel in my view, is how it adds the channel in the external user's existing list of teams and channels and does not require a tenant switch.

According to the message center post, this should be rolling out mid July and the following weeks.