New answers tagged claims-based-auth
Do your users access SharePoint via FQDN (e.g. http://sharepoint.company.com)? Then you have to add the URL of the SharePoint to a registry key called AuthForwardServerList to get your clients authenticated automatically. See this MS support article for more details on this behavior. I would recommend you to test this on one client and then roll out the ...
I figured it out. The group I was using was configured as a Distribution group and not a Security group. Also, when using the picker for adding a user/group to a sharepoint group I had to mouse over the search result and make sure I selected the entry with the Role claim.
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