SECURITY VIOLATION: User is not Authorized

Adding tickets to Apple Wallet app is controlled by the company that issued them. Have you contacted their support team? If so, what did they say?

That’s the ticket issuer’s error message. Not Apple. Are you using their mobile app or secure website?

So, how are you trying to add them? Tickets are added by using the ticket issuer’s mobile app or after logging in to your account on the issuer’s website.