SharePoint Server is a Windows Server 2012 R2 and contains the Active Directory, SharePoint and SQL Server 2008.
Local domain is:
SharePoint host name is:
sharepoint (in domain
Everything is configured like the MSDN information - I think.
If I open the site collection everything works like expected. As Administrator I get an error during the app installation. As another User I can install the app successfully.
If I click on the app as an Administrator I get this. But after entering credentials I get the same message each time. At the end its an Authorization error.
If I click on the app as a other User (which is in Administrator group and site collection primary administrator).
I really don't know what's wrong. Everything should be configured as in MSDN tutorials :(
Thanks in Advance for any hints.