I have error message.
What kind of errors do you get?
Who knows please ?
Generally speaking, it’s not possible to make both applications operate simultaneously with one drive/library, as one application or the other will lock the corresponding drive/library.
If you’re going to use Veeam as your primary tape backup solution, then, you have to stop Symantec services, and delete the Symantec specific drivers, if any are installed. Otherwise, you can implement the abovementioned key in order to keep VB&R from performing rescan operation.