Activation codes are generally single-use. If you have already redeemed the code on your Steinberg account, you cannot use it again. You don't need to re-enter the code; simply log in to the Steinberg Download Assistant on your new computer, and the license will appear in your available products.
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If your activation code is not working or you cannot find it, consider the following solutions: Nuendo Live 2 activation code - Steinberg Forums Activation codes are generally single-use
The most common reason a Nuendo Live 2 activation code "doesn't work" is using the wrong software to activate it. nuendo live 2 activation code work