I had this problem too and eventually gave up, changed the password and created a PIN as PayPal was forcing me to do. Then when all that was done it took me back to the log in page, I input the new password, and got the same message AGAIN! It seems like it's going to create a never-ending loop of changing the password without actually taking me to my account. Also, there has been no suspicious activity on my account. I would have known by seeing any fraudulent charges in my credit card or bank accounts. I did link my PayPal account to serve as the payment method for some other services recently. But that's completely normal operations, nothing suspicious.
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