It happens to me and got my problem solve. I found out that the Paypal only give 1 year temporary access to gxchange so I can't see the pre-approved payments on the list because my last transaction from paypal to gcash was already past 1 year ago. What I did was I relinked my paypal account in the Gcash app again and waala! the gxchange pre-approve payments appeared again on the my paypal list and I got my money transferred to Gcash. Hopes this helps..
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