"Connection Failed" With Error Code 1:86001S:51002S:57019S

I have Battlefield 6 on Steam (pre-ordered) and live in South Africa. My IPv6 is enabled and Teredo is qualified, and my IPv4 is standard LAN/DHCP. I keep getting ERROR CODE 1:86001S:51002S:57019S when trying to launch the game. I have tried reinstalling the game, updating GPU drivers, checking the firewall, fixing Teredo, and verifying my Steam/EA account linkage. My friend also has the game on Steam and it works fine for him, so the issue seems account-specific. I have spent over two hours troubleshooting, including unplugging USB devices and restarting, but nothing has worked. I had no issues during the Beta for BF3 and was very excited to play today. I feel stuck and in the dark because no solution has been provided by EA yet, and I would greatly appreciate any advice or solutions from anyone who has experienced this issue.