There could be multiple reasons why the payment failed, check this article for more details.
While your subscription is suspended, you will not be able to access any of the games that you have been provided with Ubisoft+.
To regain access to the service, please make a payment with your existing payment method or change it via the subscription management page. You will need to update your payment method within 7 days to resume your subscription, otherwise your subscription will be cancelled.
Please note that your games will be accessible again once your subscription status shows as Active on the My Subscription page, or if you decide to buy them.
Have a look at our Ubisoft+ section if you have any other questions about this service.