email already taken

my new email address eBay say's is already in use, how do I find out how that happened ?

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Is it really totally new?

Usually this happens when people created an eBay account with an email address in the past and then forget about it, so when they try to create a new eBay account with that email address again (or when they try to change the email address in their current account to that email address), they receive the error message you received. Multiple eBay accounts are allowed, but they must all be associated with a different email address.