BE 2012: How to restore file on tape that is not in catalog?

I never had this problem on earlier BE, sorry to ask!

Here is the question:

I have a tape, made on another BE2012 system.

I can inventory and catalog the tape fine.

But when I go to restore, the backup set from the tape does not appear in the list to restore.

I have tried adding the backup sets to a media set, etc, but it makes no difference.

What am I missing?