Some members have recently been asked by eBay/Paypal to verify their accounts, if that has happenned to you and you didn't provide the verification required, then that may explain what the problem is.
Other than that all I can suggest is to phone eBay/Paypal and ask them what the problem is.
As you may be aware, the responders here are all members like yourself so we wouldn't know what the underlying problem is.
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