Had this error message today... Was shopping on https://www.scottsdalegolf.co.uk using Safari browser on iOS and opted to pay with PayPal. I had to open the PayPal mobile site in another tab and deactivate SMS security authentication so I could login on the other browsers tab. Then activate it again two minutes later. They should offer a functionality where the code can be deactivated for 5 minutes and automatically activates again otherwise people will be tempted to leave it off to avoid the hassle. Very strange that I can login on a normal browser tab but not if coming from an online shop to complete a purchase.
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