External sharing becomes identity governance
In short: From May 2026, Microsoft is rolling out the integration between SharePoint, OneDrive, and Microsoft Entra B2B to all tenants. External sharing will then be more tightly coupled to guest identities in Entra, and old sharing links should be mapped before the transition reaches the tenant. The rollout happens automatically, tenant by tenant. When it reaches an individual tenant, EnableAzureB2BIntegration no longer has any effect. The integration also cannot be turned off, and the change applies to the entire tenant. ...