I have the same problem in France. In April, I was able to buy a ticket from my mac/safari. Now, from the same device/network, I'm denied access to southwest.com! Neither can I use the app on my iPhone/iPad! However, if I turn wifi off on my phone and connect to internet through 4G network, I can use the phone app. This is better than nothing but, obviously, not a very satisfactory solution.
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