Xenoblade Chronicles 2 has sold 1.73 million copies worldwide through March 2019. That news comes straight from Monolith Soft’s Tetsuya Takahashi, who shared the news in a crossover interview with Bandai Namco’s Katsuhiro Harada. Takahashi indicated that sales are essentially peaking at that number, which makes sense given how the RPG has been out for quite some time.
Xenoblade Chronicles 2 launched in December 2017. It was at 1.42 million copies sold by June 30, 2018. That number moved up to 1.53 million units by September 30 that year.