Netbackup 7.6.1.2 - status 96 no avail media

Hi 

i have a nbu 7.6.1.2 with a tape robot, we have now in multiple occations had this issue  - status 96 unable to allocate new media for backup, storage unit has none available (96)

But the scratch media pool has 20+ tapes with status Available (available_media.cmd) - see attached file.

I have tried to move medias from scratch to NetBackup pool and they are presented as available 

but when start af manual run it fails after a few seconds with status 96

Media and drives are configured as HCART

Scratch pool