A service ticket request by client %1 for %2 was rejected because User2User was required. The KDC responds with this error ...

A service ticket request by client %1 for %2 was rejected because User2User was   required. The KDC responds with this error when a client requests a service ticket   for a user principal (a security risk). The client must support User2User in order   to obtain a service ticket for the requested service principal
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