Allow External User to Open in Desktop App

[Shawn Keene]

I have O365 business, and I shared an Excel file with an external user (not in our AAD/domain).

They can open the Excel file in their browser with Excel Online, but the "open in desktop app" doesn't show up for them.

Is there a setting I can change to allow this external user to open the file in the full Excel program?

[#2]

this is actually a Sharepoint question. When you share the link to the excel file there are different options available to make the link read-only, make it edittable, and for internal and external users. You need to change the link settings/permissions in Sharepoint.

[#3]

Appreciate the reply. I found a thread that lists out the details: https://techcommunity.microsoft.com/t5/sharepoint/external-users-can-t-open-documents-in-desktop-app...

That includes some direct responses from Microsoft indicating how it works (and unfortunately how it won't work for me).