Dell EMC ML3 only shows 35 slots in Backup Exec but actually have 40 slots?

Hi all,

We have a Dell EMC ML3 Tape Library and are evaluating Backup Exec 22 to run with it. In Backup Exec only 35 slots out of 40 are detected in the tape library. Is there anyone who have a clue how to solve this problem? We are about to decide on running Backup Exec or not and this is a showstopper!

Backup Exec runs in a Windows server 2022 std edition.

Thanks in advance!