How delete tape and make appendable

I have tapes that are reading "Not Appendable (End Marker unreadable)"

I understand this happens for various reasons. No problem.

My issue is that I want to make the tape available for new use.

I have "associated" the media to the Scratch Media set.  But the tape still says "Not appendable..."

When we had B.Exec 2010, I was able to RT click the tape and do a quick erase.

There is no option to do so here.

How can I get the tape to no longer be marked with "End marker unreadable"?

Screenshot attached shows tape # 000008 with the issue.