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Microsoft Mission Critical Blog
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Legacy SharePoint Authentication (IDCRL) Is Retiring — What to Do Before May 1, 2026

mikeleemsft's avatar
mikeleemsft
Icon for Microsoft rankMicrosoft
Mar 03, 2026

This post explains what’s changing, how to detect legacy sign-ins, and the practical steps to move to modern authentication (OAuth) before the cutoff dates.

Audience: SharePoint admins, M365 admins, and anyone running automations that access SharePoint Online/OneDrive. This post explains what’s changing, how to detect legacy sign-ins, and the practical s...
Published Mar 03, 2026
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klyapin's avatar
klyapin
Copper Contributor
Apr 03, 2026

The article specifies a deadline of April 30, 2026.  Why was access blocked on April 2? 

The scripts provided in the article do not enable the old authentication method!

mikeleemsft's avatar
mikeleemsft
Icon for Microsoft rankMicrosoft
Apr 03, 2026

klyapin​ April 30th is the extended "opt-in" date using the commands detailed in this Blog.