Hi @pablocloud - a few months ago, you submitted an application for a developer account. However, you never responded to our follow up email (where we ask for more information about your use case) which we sent on 2/7/2018. Your application is therefore still under review. You need an approved developer account to create new apps.
Please respond to the follow-up email in as much detail as possible (it may have ended up in your Junk or Spam folders), in order for your application to proceed.