Workaround: I was unable to return the tix to VaRK for a resend to my previously existing MLB-linked email. Apparently you have to have a MLB account linked to the email address that received the tix to even return the tix. So I just sucked it up and created another MLB account with the receiving email address. At that point I could see the tix in the My Tickets window. I then logged into the MLB Ballpark App using my previously existing MLB login. Once there, I could then link that new MLB account (and the associated tix for the M&G) within the Ballpark App account. Once I did that, I could see the tix in my Ballpark App.
Talk about having to go all around the mulberry bush!