Try this it worked for us
When printing your boarding pass please ensure you've enabled pop-ups. If you’re experiencing issues when trying to print your boarding pass or luggage labels, and all the above conditions have been met, the issue could be connected to page loading. Try clicking away from the Booking Summary to another page (e.g. Before You Sail) and then click back to the Booking Summary – this will force the page to reload and should make the boarding pass and luggage labels available.
If this is unsuccessful, please check back and retry closer to departure, repeating the above if necessary.