After the initial launch Harry Potter: Wizards Unite in the US and UK on 21st June 2019, Niantic has started rolling it now worldwide.
The list of countries where the game has been released is mentioned and updated on their official website.
To get the list, you can follow this link. If your country is not listed, keep an eye on the list, it will get updated once it gets released.
Related: Harry Potter:Wizards United released in US and UK
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