You can make sure your voice profile has been correctly set up by asking 'Alexa, who am I?' The voice assistant will say 'I'm talking to. To create voice profiles, go to Settings > Account Settings > Recognized Voices > Create a voice profile and follow the onscreen prompts to set it up. This will help Alexa learn your voice and distinguish you from others in the house. If you have multiple people in your house, you'll want to set up voice profiles for each member who uses the Echo speaker. Set up household profiles on your Amazon Echo

Where it says Purchase Confirmation, tap Enable and select either Voice Profile (only your voice will activate purchasing) or Voice Code (a four-digit code). Next, on the same screen, you should set up a voice code or profile so that only you can make purchases. Open the Alexa app and navigate to Settings > Account Settings > Voice Purchasing and toggle Voice Purchasing on. To get started, you'll need to turn on voice ordering and 1-Click ordering.

That's why it can be helpful to set up voice purchasing on your Amazon Echo so Alexa can order products for you. You don't always have time to perform an Amazon search and buy something you're out of, like toilet paper.

Enable voice purchasing on your Amazon Echo