Have you tried slapping the sunroof from the topside down into the opening while operating the switch? If it has not been used in a long while, the sunroof seal itself maybe stuck, semi-glues to the sunroof opening preventing the movement. Try popping it with your hand to see if it frees it up

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)