Hello Ruud,
Thanks for your message! I hope you are doing well.
As this issue seems account-specific, it would be best to create a ticket via the support section of Sendcloud. This article goes through all the steps: How do I create a support ticket.
Once the ticket is created, we can work with you to identify the root cause and see what we can do to help get it sorted.
Additionally, please note that the Dynamic Checkout is deprecated for WooCommerce and Magento. As a current Dynamic Checkout plugin user, you can continue using the feature, but it will no longer be maintained or updated.
Moving forward, you can continue using this feature through our Dynamic Checkout API, which is currently in open Beta. During this phase, we will continually monitor and test the API to improve its performance, review the returned data, and uncover potential bugs. For more information, consult our Dynamic Checkout API documentation.
Thanks, we look forward to working with you on this!
Kind regards,
Safan | Technical Support Specialist