External Partners Could Hit ‘Access Denied’ on Your SharePoint Files
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Microsoft is retiring SharePoint One-Time Passcode authentication. Because of this change, external partners who open your shared files this summer could see an “access denied” screen. This backend shift represents a major platform upgrade. Unfortunately, Microsoft has not fully briefed most administrators on the update yet.
Microsoft is transitioning external sharing in SharePoint Online and OneDrive completely onto Microsoft Entra business-to-business (B2B) infrastructure.
Why Retiring SharePoint One-Time Passcode Links Breaks Access
New external invitations already transitioned to Entra B2B back in May 2026. However, the legacy process of retiring SharePoint One-Time Passcode options begins its final phase-out in July 2026 and concludes by August 31, 2026.
Under the old, expiring model, an external user could open shared content with a simple temporary passcode without a true account entry in your system. Under Entra B2B, they strictly require a guest account. External collaborators who historically relied on passcode access and do not have an established guest account will lose access to that previously shared content. To prevent this, you must either manually provision a guest account for them or re-share the document to trigger account creation automatically. (Note: “Anyone” and anonymous sharing links are completely unaffected).
Action Items to Prevent Partner Disruption
Since retiring SharePoint One-Time Passcode features can directly impact active B2B workflows, IT teams should take three preventative steps before the autumn deadline:
- Pull external sharing reports to isolate active external guests who have exclusively been using temporary passcode access.
- Pre-create Entra B2B guest accounts for the vital external collaborators you want to keep, or re-share the relevant content to force automated account generation.
- Brief the internal owners of those shared sites, so an external partner’s lost access doesn’t turn into an internal IT emergency.
The organizations managing this as a proactive governance project rather than a reactive support desk ticket won’t be caught off guard when the cutoff arrives. We specialize in mapping out your guest access rules to keep your external relationships secure and functional.
