I struggled with the same problem too. I was using Energico Template from WPMonster so to resolve this error:
1. Create your social link as normal.
2. Under Additional CSS i had to type the following;
/* Display whatsapp icon */
li.menu-item a[href*="wa.me"]::before{
content:'\f232';
}
This CSS code simply targets the whatsapp social link you have created and adds content to it.
I was using font awesome so i used that creepy unicode (\f232). So it may be different with you.
Tried modifying style.css but no results
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This reply was modified 6 years, 2 months ago by madechangu.