Introduction

Legacy authentication for SharePoint Online was blocked by default from 16 February 2026. Microsoft offers a one‑time temporary extension that keeps legacy authentication active only until 30 April 2026. After 1 May 2026, legacy authentication will be permanently disabled and cannot be re‑enabled.

Applies to

Spindle Document Distribution

Resolution

To apply the temporary extension as decribed in this Microsfot blog post - Legacy SharePoint Authentication (IDCRL) Is Retiring — What to Do Before May 1, 2026 | Microsoft Community Hub and keep legacy authentication functioning until 30 April 2026, set two tenant properties to TRUE:

Process

1) Open Powershell

2) Install the Sharepoint module with this command (if not already present) with the following command: 

Install-Module -Name Microsoft.Online.SharePoint.PowerShell

Connect to the Sharepoint admin URL with this command

Connect-SPOService -Url https://<YOUR DOMAIN>-admin.sharepoint.com 

You will be prompted to sign in with your admin credentials 

You can establish the admin URL by going into the Microsoft 365 admin center 

then click Sharepoint in the left panel 

When Sharepoint Admin Center opens:

The URL is displayed in the address bar (up to ...sharepoint.com)

3) Use Get-SPOTenant to display the currently configured options

and 

4) Set the two options to allow the override and to enable the override

PowerShell> Set-SPOTenant -AllowLegacyAuthProtocolsEnabled $true -LegacyAuthProtocolsEnabled $true

Then run Get-SPOTenant again to confirm the change

and

You should now be able to connect to Sharepoint through Spindle Document Distribution Tools.

Another way to workaround the issue is to create a network drive to use temporarily until a long term solution is issued.

Notes

These settings must be applied before 30 April 2026. After this date, legacy authentication will no longer be supported, and services such as Spindle will be unable to use legacy authentication for SharePoint Online.

Draycir are actively developing a long‑term solution and will share a release date as we get closer to completion.