I don’t get where I’m incorrect. Iran provided no assistance to the Mujahideen, other than some tiny Shia groups in a failed attempt to export their revolution early on. Iran hated the mujahideen and the Taliban, viewing them as Pakistani oriented.
Iran even backed Armenia against Azerbaijan because the Azeris were orienting themselves towards the West and needed to be “punished”.
Khomeini did not back the Soviets against the mujahideen.