Hi,
I have a customer with a Modern Desktop based on Azure AD join, Intune and M365 Apps for Enterprise (Monthly Channel). Customer utilises SharePoint Online for files. Any Excel documents opened from SPO open in Protected View. All other Office documents (i.e. Word and PowerPoint) opened from the same SPO site do not open in Protected View. The Protected View message is "Be careful - files from the internet can contain viruses. Unless you need to edit it, it's safe to stay in Protected View". I've got the customer SharePoint Online site successfully configured and reporting as a "Local Intranet" site even, and still no dice. The SharePoint Online URL (https://customer.sharepoint.com) is in Trusted Locations in Office as well. If added as a mapped drive (manually via File Explorer or using "Cloud Drive Mapper") and I have that drive letter in Trusted Locations, I still get it.
Thoughts on what to try? I'm at my wits end. We don't want to get rid of the error by dropping the security level and not prompted for Protected View (for legitimate cases when a users has downloaded from the Internet).
Thanks,
Matt

