The "Do Not Honor" message is triggered by the registrant's financial institution and is sent back to the system. There are a few common reasons why this occurs:
Daily card limits
Incorrect Billing Info
Card has been frozen due to suspicious activity
The "Do Not Honor" message is out of the control of the software and the recommendation is to try again and see if it goes through.
If you're still receiving the message, please connect further with your financial institution to better understand any limitations that may be in place with the card you're using.