duāndàoduānjiāmì
ㄉㄨㄢ ㄉㄠˋ ㄉㄨㄢ ㄐㄧㄚ ㄇㄧˋ
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 端到端加密 and it comes back until you know it.