vue-reCAPTCHA does not work

Hello, I'm using the vue-reCAPTCHA package to insert one.

This capcha is a sub component so for use within the sub component I do the following. This is the script:

import VueRecaptcha from 'vue-recaptcha';
export default {
     components: {
         VueRecaptcha
     }
}

The component:

<vue-recaptcha ref="recaptcha" 
     @verify="onCaptchaVerified"
     @expired="onCaptchaExpired" size="invisible"
     sitekey="mi llave">

  <v-btn :loading="loader" :disabled="loading" color="secondary" @click="loader = true">
           Accept Terms
  </v-btn>
</vue-recaptcha>

But I get the error:

Error for the owner of the site: The site key is not valid

I realized that at:

<div class="g-recaptcha" site-key="mi llave"></div>

It does not appear in the sun