Kuala Lumpur is 8 hours ahead of Reykjavik
Best overlap: 8:00 AM to 10:00 AM in Reykjavik is 4:00 PM to 6:00 PM in Kuala Lumpur.
Reykjavik and Kuala Lumpur overlap from 8:00 AM to 10:00 AM (Reykjavik) to the equivalent 4:00 PM to 6:00 PM in Kuala Lumpur — that's your meeting window. The shared window is only 2 hours — treat 8:00 AM in Reykjavik (4:00 PM in Kuala Lumpur) as the one fixed point and plan everything else around it.