Relations are not really warm between Afghanistan Cricket Board and Cricket Australia. CA cancelled the Afghan tour of Australia, citing the Taliban takeover. And as a response, Rashid Khan and other Afghan cricketers decided to boycott BBL. And both CA and ECB has requested the ICC to suspend ACB, given the lack of a women's national team (which is a mandatory requirement even for the associate members). And now Afghanistan has knocked Australia out of this tournament.
CA can hide behind this "Taliban" excuse but the fact is they don't see any monetary benefit of a bilateral series with Afghans, hence they avoid everything with virtue signaling.
Similarly, that's the main reason CA was never interested in hosting Bangladesh as well and Bongs don't have a Taliban problem.