Signing into Microsoft Purview Information Protection does not save credentials

Hello!

I hope you are doing well, and we apologize for the delayed response and the trouble.

Try the following steps, and let us know how it goes: 

Clear and Reconfigure MPIP Credentials in Acrobat

Sometimes Acrobat stores corrupted or incomplete credentials. To reset:

• Open Acrobat
• Go to Preferences > Security > Microsoft Purview Information Protection
• Click “Clear remembered account information.”
• Restart Acrobat and sign in again

This step ensures that Acrobat resets its internal token cache. See this community discussion for more information: https://adobe.ly/4l8VlIX

Disable Browser-Based Authentication (If Applicable)

If Acrobat is using browser-based authentication (which is common in enterprise environments), it may not persist credentials across sessions. Adobe recommends disabling this mode if persistent login is needed:

• Follow the steps in this Adobe guide: https://adobe.ly/3TrRuuO
• This involves registry edits (Windows) or plist changes (macOS) to force Acrobat to use native authentication

Ensure Registry or Plist Settings Are Correct

For Windows:

• Open regedit
• Navigate to: HKEY_CURRENT_USER\SOFTWARE\Adobe\Adobe Acrobat\DC\MicrosoftAIP
• Ensure bShowDMB is set to 1

For macOS:

• Use Terminal to run:
  sudo /usr/libexec/PlistBuddy -c "Add :DC:MicrosoftAIP:ShowDMB array" ~/Library/Preferences/com.adobe.acrobat.pro.plist
  sudo /usr/libexec/PlistBuddy -c "Add :DC:MicrosoftAIP:ShowDMB:item1 bool true" ~/Library/Preferences/com.adobe.acrobat.pro.plist
  sudo /usr/libexec/PlistBuddy -c "Add :DC:MicrosoftAIP:ShowDMB:item0 integer 0" ~/Library/Preferences/com.adobe.acrobat.pro.plist

These settings help Acrobat retain MPIP-related preferences and improve session persistence.

This issue may occur in environments using sensitivity labels with encryption, which require stricter token validation. If you're using Microsoft Sovereign Cloud or Double Key Encryption, additional setup steps may be required. 

I hope this helps.

Thanks,

Anand Sri.