У вашего броузера проблема в совместимости с HTML5
Kudos to "The Division Secrets" discord channel https://discord.gg/T6h2dEJ
Thanks to them we now are missing just one ivory key.
Join them if u wanna help solving the next puzzle or just to say thank you and see what's up.
source: https://forums.ubi.com/showthread.php/2023173-We-solved-the-next-riddle!-Ivory-key-7-8-awaits-you!