Request for Documentation: bEnableDefaultSignIn Registry Key for Acrobat + Microsoft Purview

I'm working on deploying Adobe Acrobat with Microsoft Purview sensitivity labeling (MIP) integration in our organization.

It seems like there is a registry key named bEnableDefaultSignIn under HKCU\Software\Adobe\Adobe Acrobat\DC\Security\MSIP or HKLM\SOFTWARE\Policies\Adobe\Adobe Acrobat\DC\FeatureLockDown that enables automatic sign-in using the Windows user's Microsoft Entra credentials — which is essential for seamless MIP functionality.

However, this key is, apparently, not documented in any official Adobe resources, GPO templates, or deployment guides.

Could you please confirm whether:

• bEnableDefaultSignIn is a supported setting

• It will remain supported in future releases

• It will be included in official documentation or GPO templates

Having this officially documented would be a great help for secure enterprise deployment and audit readiness.

Thank you!

Romain DALLE (Microsoft Purview MVP, MCT)