Adobe Document Cloud PDF Experience for Office 365 and SharePoint Online document library in IE11

[FRANCIS0101]

• We have deployed Adobe Document Cloud PDF Experience for Office 365.
• The user has set the default browser to IE 11 (for using legacy business applications).
• There are PDF documents in a SharePoint Online document library, and the user wants to open them in Adobe Document Cloud, so he can markup and annotate.
  
• Using IE11, he does see the option to Open in Adobe Document Cloud when he opens his OneDrive webpage, and then uses the left navigation pane to navigate to the SPO document library.
• But when he browses directly to the SharePoint Online site, and then opens the SPO document library, then he does not see the option to Open in Adobe Document Cloud (only sees Open in browser)
  
• His "trusted sites" are configured as specified here: https://helpx.adobe.com/document-cloud/help/office365-configuring-sharepoint-onedrive.html

Please recommend a fix for this. Thanks

[Daniel5E7D]

A few items to try:

1. Try clear cache/cookies (this is what worked for me when it showed the option in Edge but not Chrome)
2. Ensure the user has permission to use the app, check via Azure Console
3. Ensure 'all cookies' are enabled
4. Add an exception for cookies "Sites that can always use cookies" for dcsi.adobe.io