For checking the accessibility of a Powerpoint presentation.
I checked alt texts for images, slide reading order, unique slide titles and sufficient contrast for text and background colours.
Learn what things improve accessibility in your PowerPoint presentation:
https://support.microsoft.com/en-us/office/make-your-powerpoint-presentations-accessible-to-people-with-disabilities-6f7772b2-2f33-4bd2-8ca7-dae3b2b3ef25
Learn how to use Accessibility Checker:
https://support.microsoft.com/en-us/office/improve-accessibility-with-the-accessibility-checker-a16f6de0-2f39-4a2b-8bd8-5ad801426c7f#picktab=windows