guójiābiāozhǔnmǎ
ㄍㄨㄛˊ ㄐㄧㄚ ㄅㄧㄠ ㄓㄨㄣˇ ㄇㄚˇ
Simplified 国家标准码
Taivo → Settings → Partner inbox → Make the link. It stays in this browser.
Keep 國家標準碼 and it comes back until you know it.