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Have a chill chat with him to figure out how he likes to communicate and work. Make sure he knows exactly what’s expected in his job – clear and simple works best. Touch base with HR; they might have some useful tips. Maybe tweak how you talk to him, like being more straightforward or writing things down. Regular, straightforward feedback's good too. If it's still tough, maybe find an expert for advice. Try to learn a bit about autism, as it’ll give you some insight into his actions.