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"User authentication failed due to invalid authentication values" donation error message

We have a new authorize.net merchant account. Test transactions directly through authorize.net are working.

In testing donations through my nation, I get this error message both in and out of test mode.

"User authentication failed due to invalid authentication values"

According to authorize.net, this error message is related to a discrepancy between a test and production environment. But given that we're accessing it through NationBuilder and not a custom implementation, I don't know what to check for.

I'm certain I have the right API login ID. I've even reset the transaction key several times, updating my nation each time with the new key. I have recurring billing (ARB) and customer information management (CIM) enabled through authorize.net, and my silent post URL has been correctly added to my authorize.net account.

Any suggestions as far as what else to look for?

Official response from

Please see below for some suggestions!

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