Why my social links looks odd

I’m aware that two of the social links I’ve provided looks rather odd, just showing the default link/chain symbol instead of an icon referencing the social media website.

I assume this is because neither Vero nor Facebook Messenger have a “social media icon” that Squarespace knows how to find/look for. I will report it, not sure if this is something Squarespace can fix or if the sites themselves need to fix. There is now way for me to override the icon at least.