You can't add the 4th job mage skill 'Infinity' into skill macros. Not 100% on this since I got infinity like a few days before new source and I'm pretty sure I could add it to macros before. Google says it's not meant to go in macros so perhaps it just got fixed lol
You can't add infinity to macro because it has a cool down. Pretty sure it's the same for all skills with a cool down. It wasn't something you could do in GMS either.
I already have a thread about this bug (for other skills here): https://royals.ms/forum/threads/some-skills-cant-be-put-into-a-macro.87619/
@Epicene is correct in that skills with a cooldown, and also skills that require a key-down press (e.g Big Bang), can't be put on a macro.
Correct, as it is a cooldown skill. A lot of things in the old source didn't work as intended so it doesn't surprise me that it may have been possible before.