the following is an answer given by Marc Velasco from IDEA about 2 years ago. Not sure whether it is still a valid process but it is worth checking out. If all else fails, you can always contact ACE directly.
“In order to receive the IDEA discount on the ACE website, you must verify your IDEA membership on the ACE website using the email address and password linked to your IDEA account. Please note that this password must be a unique password that has been created on the IDEA website.
If you’re still getting this error, please login to the IDEA website, reset your password to a new one, and then try verifying this new information on the ACE Website. Upon checkout on the ACE website, there will be an IDEA member verification box. Here you will need to type in your email address linked to your IDEA account, as well as your new password. Once the system verifies your account, you will see the discount applied on your checkout. Thank you.”