Client-side deduplication is enabled for this job, but it could not be used

Good morning,

i am running Backup Exec 2014 SP2 on a freshly installed Windows Server 2008R2 Device with internal Deduplication Storage. Client side deduplication is enabled for the deduplication storage.

All Backup jobs are built from scratch with client side deduplication enabled but all jobs are finishing with exceptions:

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