It seems that Cloudflare is blocking the SNCF passenger WiFi. So up to 300,000 travelers each day on the TGV cannot access Flyertalk. No VPN involved.
Error code: 1020
Ray ID: 7811a68b5853f196
Country: FR
Data center: cdg11
IP: 89.207.171.76
Timestamp: 2022-12-29 09:53:46 UTC