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Typically when I run into airline website issues like this it is either:
1) VPN – so turn it off
2) Ad blocking – turn off all extensions and ad block settings (sometimes this is built into the browser)
3) Browser issue – try Chrome, Safari, Firefox, etc
4) Desktop issue – so try using their mobile apps
Usually one of these changes will fix it.
Otherwise, you will have to call in and manually book it.