About three days ago, the call buttons on my Facebook have completely disappeared. The attached screenshot shows what I see when I open a messenger window. I can't call anyone. What's strangest is that no one can call me either--their buttons have disappeared too, but only for me.
It's not a network or a computer issue, I've confirmed as much. It has to be something with my account, but I am completely stumped. Please help me out here.
Thank you in advance!