Kbin needs /m/asklemmy@lemmy.ml (domain is important) or a bit simpler is with an @ symbol in front: @asklemmy (note: the domain is here but kbin currently renders it without the domain -- that needs to be changed as it has potential to confuse and mislead)
Downside to the /m/asklemmy@lemmy.ml format is that it doesn't currently auto linkify. Gotta do [/m/asklemmy@lemmy.ml](/m/asklemmy@lemmy.ml) (/m/asklemmy@lemmy.ml)
Hopefully kbin soon fixes the !asklemmy@lemmy.ml syntax. It's currently broken. Once fixed, that should work for everyone.