Ensure the wallet card has a Server API Info indicated, and Samsung server IP addresses are whitelisted in your end.
Go to the Wallet Partner Portal > Manage Wallet Card > Edit > Input your server in “Partner Get card data” and “Partner Send card state”.

Visit Extension for more information.

All images used should have the file size at 256 kB maximum.

This issue may be a result of an incorrect Cdata Generation.

Ensure the following:

• The card uses the correct certificate ID.
• The certificate is up-to-date.
• The JWT token follows the correct key and version.

Visit Implementing ATW button for more information.

Alternatively, this issue may be a result of missing fields, incorrect attributes, and inconsistent formatting.

Ensure the following:

• The partner ID used is correct.
• The headers follow the standard structure.
• The card data format follows the standard structure of the wallet card.
• The attributes and their values are free of typographical errors, and redundant spaces.

Visit Wallet Cards Specification for more information.

This issue may be a result of the JWT header UTC value had over 30+ seconds.

• JWT must be generated within clicking ATW button.

This issue may be a result of server and infrastructure configurations.

• Review the firewall rules, TLS chain, and endpoint URL.
• Verify the connectivity of the server-to-server communication with Samsung.

This issue may be a result of the card in DRAFT status.

• Visit the Wallet Partner Portal to launch the card.
• Review the card type assigned.

Alternatively, the created wallet card is not supported in the country or region.
Visit Manage Wallet Cards for more information.