Thanks for your reply. That works only from Server or Tableau public. But I need to export it from Tableau desktop
I am facing the same issue. Solution I use at the moment is getting it in pdf from tableau desktop, convert to jpg (free tools available online) and drag into ppt.
To remove a lot of white spaces in the pdf, I use crop white spaces pdf tools (also available online) such as https://croppdf.com/ .
There are no other ways that allow users with no access to Tableau online or server.
Someone did use vba to make it automate. I have yet to try. Output Tableau dashboards to PowerPoint
One only other solution is to upload to Tableau public, download LiveSlides - Embed any website in a PowerPoint or Keynote presentation , then add inside ppt.
However, if you do not want your charts available for public, then my former is the only solution.
One person used Adobe pro. Convert Tableau to PowerPoint | VizPainter But most people dont have it. If you have, save as pdf and just convert.