Your email address is your username for your Dropbox account. If you’re not sure what the email address on your Dropbox account is, you can find it from a device you linked to your account, through a folder you shared, or through your payment information if you purchased a subscription.
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How to find the email address on your Dropbox account
If you see an “Account doesn't exist” error when you try to sign in to Dropbox, you may have signed up for a Dropbox account with a different email address. The “Account doesn't exist” message is usually caused by a mistyped or incorrect email address. In other words, the actual email address on your account is different than the one you typed in. If you see this message, first try signing in again. Be sure to check the email address and its spelling.
If this you know your email address and still receive this message, or if you received an email notification from us about an inactive account, your account may have been deactivated.