Hi, Not intuitive but: Go to security in your account. Select update for 2-stage verification. A 'Manage 2 factor authentication' page comes up. Remove any device that says two stage security is not being used. You now will have to get verification for any payment/log in from any device. I had the same problem as at some payment I must have selected 'yes' when asked if I wanted Paypal to remember this device, which it does every time!
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