So I got a Pocophone F1 this month and all my contacts are on an iPhone 5s and when I try to export vcard it says "Couldn't export vcard". Oh and by the way it was icloud.
You might also want to post your question here: https://forums.imore.com/. But maybe don't mention that you're migrating them to an Android phone -- that might put you at risk for the forum equivalent of having rotten tomatoes thrown at you.