American Express, Discover test cards are declined w/ confiscation message

[jbnv]

I'm getting started with Authorize and developing a PHP code library for use in multiple projects. I have a test suite that runs the valid test numbers through the API and expects a successful response.

I'm not getting a successful response for 370000000000002 (AmEx) or 6011000000000012 (Discover). Instead I'm getting CardDeclinedException: "Card declined. The processor indicated to confiscate the card."

The Visa and MasterCard numbers are passing the test so I doubt that it's a coding issue on my part. But I could be wrong. What is the problem and how do I fix it?

[jbnv]

Now on my second test run, all of the numbers are being declined with the same message. 

[RichardH]

Hello @jbnv

Could you please confirm that you are testing using our sandbox and not a live production account.  And it would also help if you provided a sample gateway response for a declined transaction.

Richard