Microsoft has announced the retirement of the IDCRL authentication protocol in SharePoint Online and OneDrive for Business as part of the Secure Future Initiative.
𝑲𝒆𝒚 𝒅𝒂𝒕𝒆𝒔:
𝐉𝐚𝐧 31, 2026 – Legacy auth blocked by default (can temporarily re-enable via PowerShell)
𝐌𝐚𝐲 1, 2026 – Permanent retirement
If you’re still using older clients, scripts, or apps that rely on IDCRL to connect to SharePoint Online or OneDrive, they’ll stop working unless you migrate to modern authentication (OpenID Connect/OAuth).
Don’t wait until the last minute. Start now:
✅ Audit your environment for anything still using legacy auth
✅ Loop in your dev teams and app owners
✅ Test your migration to modern protocols in a staging environment
✅ Update your documentation
Modern authentication is more secure, more reliable, and better supported. The sooner you make the switch, the less stressful January will be.
