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It looks like they permanently limit your account if they say 180 days to withdrawal your money. Never use fake info because you want no one to know your name, or use nickname or middle name as the first name with online financial accounts. Name has to be same as on your ID and documents. That is the mistake you made. I just hope you do not have a problem transferring to bank when 180 day comes.
Can you make a name change from your account settings?
Depending on the name change you are making, you may be required to upload documentation. PayPal will update your name for you after they review the documents if you are not making one or two letter changes to your name.
Since the payment is recent, they may not let you transfer money earlier because they want to make sure money is there because buyers have 180 days to file dispute against your account so let’s hope the buyer of your watch don’t find a problem and want their money back.