As far as I know there is no hands-on lab available which uses tape. But you can build your own lab with a virtual tape library. There are some free solutions available, like the Storeonce VSA from HPE or the Starwind VSA which can emulate a tape library.

Yep never seen a tape lab but I use the Starwind VSA and it works very well to simulate a tape drive with Veeam to learn.

AS far as I remenber, we use to use library on the VMCE class version 9, but not anymore.

as Chris and Max said, you can use HPE VSA and Storwind, that is very simple to configure, the storwind is simplier.