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If you are already logged in somewhere else, check the code on your other device.
If you're trying to sign up for their service via their APK, you will see what you see now (I don't know if it's bug or intended behavior). Install it from the Play Store, from there you can request SMS to your phone number (both to sign in or sign up). Once you're running Play version you can use it to sign in into their website APK version.