Wallet icon gets blue box surround when I try to download tickets

Outlook is doing something odd to the link. The link should install a ticket/pass in your Wallet app. I don’t think Outlook or web based mail will correctly handle the command. You need to use Apple Mail or a Google Mail app.

Yes, I know that. I add tickets and boarding passes all the time. Outlook is a well documented issue. Web based email rarely works in my experience. But if you access via Safari web browser you might have success.

It’s possible it’s the Wallet app, but deleting the app will remove all your tickets, passes, credit and debit cards. They will need to be added back to your Wallet app.

Please review the instructions for adding tickets below. I’ve included a link to an Apple Support article that contains additional information on adding tickets etc. to Apple Wallet app.

>>How to add a boarding pass, ticket, or other pass to Apple Wallet on your iPhone

1. Open the app, email, notification, or other communication that contains your boarding pass, ticket, or other pass.
2. Tap Add to Apple Wallet.

1. Follow the instructions on the screen.
2. If necessary, tap Add in the upper right corner.

If you don't see an option to add your boarding pass, ticket, or other pass to the Wallet app, contact the merchant or company that issued it to make sure they support passes in the Wallet app.

When you add a boarding pass, ticket, or other pass to the Wallet app on your iPhone, you automatically add it to the Wallet app on your paired Apple Watch.

Learn how to remove a pass or ticket from the Wallet app.<<

Add, use, and share boarding passes, tickets, and other passes in Apple Wallet - Apple Support

Do you have any Accessibility features enabled on your iPhone?

What app are you using for email?

Your tickets are expired, and can’t be added to Apple Wallet.

Downloading from what, your iPhone? Are you trying to share your tickets or what exactly?

What app is that, please?