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To my understanding, you cannot edit the teams field of subtasks in ARJ.
This is supported by the idea that subtasks are not independent issues, rather they are parts of a large unit of work. So for example, if a parent issue belongs to Team A, then part of that issue (i.e. subtasks) also belongs to Team A naturally. You can’t assign Team B to the subtask as it would logically contradict the integrity of ownership on the task level.