Hello Johnny-fm,
Welcome to Apple Support Communities.
Did you recently get a new iPhone or new Apple Watch? If not, have you made any recent changes to your ipHone and Apple Watch? If so, what changes have been made? What is the exact error message you receive, if any?
Please try the steps here as they may help resolve concerns similar to yours: Add, use, and share boarding passes, tickets, and other passes in Apple Wallet - Apple Support
- Open the app, email, notification, or other communication that contains your boarding pass, ticket, or other pass.
- Tap Add to Apple Wallet.
- Follow the instructions on the screen.
- 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.
Let us know if you have further questions.
Take care.