I have configured the signature key in my Sandbox account.  On the "API Credentials & Keys" account setting page, I see "Signature Key Last Obtained:" with the timestamp of when I configured it, so it seems like it really is set.

I am using the API Live Console to try the API transaction here:

https://developer.authorize.net/api/reference/index.html#payment-transactions-charge-a-customer-prof...

The response contains "<transHashSha2 />" - no value.

I know the API credentials used in the test are the correct credentials b/c I see the transaction appear in the "Unsettled Transactions" list of the same sandbox account where I configured the signature key.

Is there some additional setting I need to configure to get the new hash value to be returned?