
@frob-0826
Thanks for your explanation.
Yes, there is such "Everyone Except External" group. OneDrive for Business like a personal SharePoint site.
You may go to OneDrive for Buiness, right click the files you need to share > Manage access > Advanced (An option at the bottom of the panel) > Stop Inheriting Permissions, OK (This action could create unique permissions for your shared files) > Grant Permission > Then you may enter "Everyone Except External".
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