I would recommend reaching out to PayPal customer support to learn more about the problem with your PayPal wallet. If you need further help from our end, feel free to follow up here or via PM with me. Thank you.
I have linked my PayPal email with work and the Paypal is also showing the billing agreement with Upwork. Still, whenever I'm trying to hire someone, it is showing charge failed. Please let me know how can I fix it and get the work done ASAP.