Some fontawesome icons don't show up

[MrTucks]

When editing the possible answers of a poll you can choose icons, and it says "any FontAwesome Icon" so I tried some out.
Works: github, twitter, facebook.
doesn't work: discord, square-github.

Why is that?
Expected behaviour:
I can go to fontawesome.com, search for any icon, copy and paste its name, and it should show up in my poll. But some don't seem to work.

I tested latest Firefox and Edge on Windows 11.

[lilioid]

It's probably because the used fontaswesome version is roughly 5 years old

[Akasch]

Bitpoll currently uses Fontawesome 4.7. In newer Versions the names of some icons have been changed, so updating will need some work. Also some icons seem to be no longer included in the free version, I don't know if we use any of them.

[MrTucks]

I see. Thank you