The Goal
Share one specific folder in a SharePoint site with an external user (outside of tenant organization) and include Edit permissions without the user needing a Microsoft account.
My Environment
- SharePoint Online
- Admin Center > Policies > External Sharing > Most Permissive/Anyone (See a screenshot here)
- Admin Center > Site > External Sharing > Anyone (See a screenshot here)
- I do have custom code running: tenant wide extensions and web parts.
Expected and normal behavior
Microsoft confirmed (via my personal ticket) that it is possible to share just one folder to an external user. I also tested it on another tenant and the external sharing was successful. Therefore, I know it's something to do with my specific tenant.
The Issue
When I share the folder via "Copy Link" or "Share", after the external user enters the verification code, they can open the folder and it appears just briefly (1/2 seconds), but then the page gets redirected to my organizations' login screen.
When I share the folder via "Manage Access" > "Advanced" > "Grant Permissions":
It won't even let me share it. I get an error within the browser:
Sharing failed: Operation is not valid due to the current state of the object.
The issue occurs on all classic and modern Team and Communication sites.
