The OCC revised their 80s year end lists in 2021 and they said 'Into the Groove' sold 793k in 1985. I'm guessing the 562k figure they gave earlier today before updating the article really was the post-1994 sales as that would bring its total to 1.355m which rounds up to 1.4m (plus it'll have achieved a small amount of physical sales after 1985).

The new article also says 'Into the Groove' has sold 907,500 pure sales, an increase of 30k since August 2016. Only a nearly 30 years to be an official million seller!

Last known streaming total was 36.1m in September 2023, an increase of 18.3m streams.

https://www.officialcharts.com/chart-news/madonna-into-the-groove-number-1-single/

'Into the Groove' had 191k post-1994 sales as of the w/e 20 December 2019 - assuming the 562k figure is its current post-1994 total, that means its averaged 1,266 chart sales since. At the rate, it would be certified Platinum in March 2026.

Glad they updated it! 1.4 million is huge!