https://community.tableau.com/s/question/0D54T00000C6TtzSAF/embed-tableau-workbook-in-powerpoint
Refer to this link hope it helps.
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The step-by-step tutorial
Step 1: The PowerPoint File

Open an existing PowerPoint presentation or create a new one, insert a new slide (layout title only or blank) and save it as a PowerPoint Macro-Enabled Presentation.

Step 2: Embed the Tableau Packaged Workbook

On the Insert Tab of PowerPoint click on Object, Create from File, browse to the Tableau Packaged Workbook and click Ok:

Insert Tableau Workbook

Go back to the Home Tab, click on Select and Selection Pane and rename the generic object name (e.g. “Object1”) to “Tableau Workbook”. This is optional and you can change this to whatever you want, but a clear name will help us to refer to the object in the VBA.

Step 3: Insert an Image exported from your Tableau Workbook

This is an optional step, but from my point of view it looks best if you have a static image of one of your dashboards in your PowerPoint presentation and open Tableau by clicking on this image.

First you have to create the image. Nothing new under the sun, you certainly know how to do this. Open your Tableau workbook, go to the dashboard and in the main menu click on Dashboard|Export Image and select JPEG as the file format.

Next, go back to PowerPoint, click on the Developer Tab and on Image (ActiveX control):Insert Image ActiveX ControlRight click on the inserted ActiveX Image control on your slide, select Properties, go to the property Picture, click on the three dots at the right and browse to the image.

Follow up question