Hello @jheng7,
Welcome to the PayPal Community! Normally, a failed link between GCash and PayPal is due to some kind of information mismatch between the two parties. I would recommend making sure all information ( first / last name, phone number, email, etc) matches between the two profiles. If you need to update something on PayPal's end, you can do so with the following steps: How do I view or edit my account information?
If you need to update something on GCash's end, I recommend reaching out to their Customer Support for further assistance. Best wishes!
- Jon K
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