They do site "improvement" tests from time to time. This was probably part of that. On the flip side, I have had to do a phone confirmation as part of the sign up process in the last few weeks. Only had it that one time.
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IDENTITY CONFIRMED UK PAYPAL ACCOUNTS FOR SALE - HERE PAYPAL IDENTITY CONFIRMATION SERVICE - £50
The last 3 accounts I have started selling ask for phone verification on the second sale for some reason. Also all 3 have also prompted letter pin services