It sounds like you've got a second account with Spotify. Are there any other email addresses you could have used to register with Spotify? It's worth checking those inboxes to see if you have any Spotify emails -- that will mean your extra account is registered with that email.
- If you don't have another email address, note how you log into the Spotify app usually.
- If you use your Facebook details try entering your Spotify username (if you created one originally).
- If you use your Spotify username try entering just your email address.
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