Believe it or not -- this is likely due to a safety/security feature between the Apple Wallet and the TM App.
It even states on the TM.com website My ticket isn't working in my Apple Wallet. What should I do?
"Any tickets purchased from an individual Ticketmaster account can only be linked to one Apple ID."
While you and your wife are sharing the TM account, you probably each have your own Apple ID that you use with the iCloud on your iPhone.
The Apple Wallet uses the Apple ID that is signed into iCloud to associate with the items which are added to the Apple Wallet.
Here's one way to think of it:
iPhone A -- Apple ID-A for iCloud
iPhone B -- Apple ID-B for iCloud
TM app -- same ID used on both iPhone A and iPhone B
When you purchase tickets from your TM account using the TM app on iPhone A -- which uses Apple ID-A on the iPhone to sign into iCloud -- and then add the tickets to the Apple Wallet on iPhone A - that causes the TM app to "see" Apple ID-A as the Apple ID to be use with the account.
When you purchase tickets from the same TM account using the app on iPhone B -- the TM app is still looking for Apple ID-A when you go to add the tickets to the Apple Wallet, but it's seeing Apple ID-B. This is what is causing the "Pass Disabled" message. Since the Apple IDs are different the pass is automatically disabled for safety and security.
One way to resolve this is to have TM.com account for you to use on your devices, and another for your wife to use on her devices. That way each Apple ID is associated with a separate TM account. If you need to each have your own tickets on your devices you can easily transfer the barcodes from TM-A account to TM-B account.
Hope that helps to make things a bit clearer.