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...

Microsoft is adding Google as an identity provider for B2B guest users

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This is strictly not a Teams feature, but it does give the advantage of inviting gmail users to your Teams Team natively.

There is no need to do any changes for those users with gmail accounts you already have invited, as they have created their personal Microsoft accounts. But if you and the google admins want to create a B2B connections, users no longer have to create those personal accounts.

The guidelines for Google B2B setup can be found here. And according to a recent message in the Admin portal in Office 365, it should already be available in preview.