TOPIC: Authorize.net AIM not working

DT Register Version: 3.1.6e
Joomla: 3.4.8

Have verified that SIM works but AIM results in following message upon credit card info submission "Reason: The merchant API login ID is invalid or the account is inactive. Please notify the site administrator." when used with Method Curl1 and just gets a button to "Try Again" with AIM using Curl method2. My client needs to keep transactions on the site, please test and advise.