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The correct way to specify the icons in html should be:
<fa :icon="['fas', 'envelope']" />
<fa :icon="['fas', 'lock']" />
<fa :icon="['fas', 'sign-in-alt']" />
<fa :icon="['fab', 'google']" />
<fa :icon="['fab', 'linkedin']" />
<fa :icon="['fab', 'twitch']" />
Source:stackexchange.com