Sign in with the email address that you want to change to (not with your current email address). In this case, sign in with firstname.lastname@example.org.
Swap or change your Adobe email address
Change your Adobe email address to a new or a previously used email address.
If you try to change your Adobe email address to an email address that you previously used or one that is currently in use, the error message "your account changes couldn’t be saved" might be displayed. Follow the steps below to learn how you can swap email addresses between two Adobe accounts.
Change to an email address that you have not previously used
Learn how to change to an email address that you have not previously used.
If you don't have another email address available, you can change your current email address to a previously used email address, as described in the next section.
Change to a previously used email address
Let's assume that you want to change your Adobe ID email address from email@example.com to firstname.lastname@example.org.
To make this change, first free up the email address email@example.com. That is, ensure that this email address is no longer associated with an Adobe ID. To learn how to do this, proceed as follows:
Change this email address to another email address you own. For example, you can change it to firstname.lastname@example.org. (See detailed instructions.)
You have now freed up the email id email@example.com as it is no longer associated with an Adobe ID. Next, replace firstname.lastname@example.org with email@example.com as described in the following steps.
Sign in with the email address firstname.lastname@example.org.
Change the email address to email@example.com.
The email address associated with your Adobe ID account gets changed from firstname.lastname@example.org to email@example.com.