A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
Hi Noah_432,
So sorry for this inconvenience caused to you.
To investigate this issue, I just made a test to record my presentation and export it to a MP4 file. It worked normally using My Excel app, so, I am afraid this issue may be due to your environment.
To narrow down this issue, please try to create a new PowerPoint file to see the result. And you may refer to the following articles:
Record a slide show with narration and slide timings - Office Support (microsoft.com)
If the issue doesn’t happen to the new file, it means there may be something wrong with your current one. Given this situation, you may try to copy and paste the content form the old one to the new presentation.
Otherwise, if the issue also happens to the new file, feel free to contact me. Moreover, may I confirm the following information for a better understanding of your situation?
- The build and version information of your Mac? (Apple menu > About this Mac)
- The build and version information of your PowerPoint? (PowerPoint >About Microsoft PowerPoint)
Best Regards,
May