Trying to buy a ticket for this and Daz’s testimonial but I’m getting an error message saying my browsing activity has been paused.

We've detected unusual behavior on either your network or your browser.
To resolve this:
• Sign in to your account if you haven't already
• Change your Wi-Fi or cellular network
• Switch devices or move to a different location if possible

Not on my VPN, tried both WiFi and mobile data, tried different browsers, tried phone and laptop - all the same.

Any ideas?