can not backup with "backup exec" on "EMC DataDomain" VTL

hello,

i have an "EMC DataDomain" Appliance with Full Feature Licensed, as VTL and more...

also, i have a "Veritas BackupExec 2016" Full Feature Licensed, as VTL and UDO (unlimited drive option) and more... it mean i should be able to discover my EMC DataDomain VTL Drives (one drive or more) in backupexec, and use...

but now, when i config VTL (step by step with emc guide), and connect it by fiber to my Backup Exec physical server, backup exec discover just one of the drivers that i create in EMC DD, ((and good news that i can backup to that one vtl drive!))

and when backup exec discover all of the drives, they are offline and disable, i manually enable them, and try the backup job, but job start and freeze in QUEUED.

i have not any task on EMC DataDomain, and want just use the vtl

i restart the backup exec services

i restart the backup exec server (physical server)

i restart the emc

i reinstall the backup exec, and drivers

i retry and reinstall the driver with "tape installer" (because of my windows server 2008)

and also i have the problem yet, please help me. thank you..