Creating accessible reports in Microsoft Power BI is similar to creating accessible documents in other software. You will need to be aware of the principles from the basic accessibility checklist and watch out for color contrast, the use of symbols, and other criteria. There are also two important things you will need to do to each page of a Power BI report to make sure it's fully accessible:
- Make sure each card or visualization on your report has appropriate alternate text. Just because you've put text on a card does not necessarily mean the text will be read when the card has focus. It's best to use a screen reader to test your dashboard and ensure everything makes sense when you tab through it, fixing any alternate text issues you encounter
- Make sure the tab order makes sense on your dashboard. Often, cards and visualizations are added in random order during the development phase, and the tab order needs to be fixed before the dashboard is finalized.
To learn more about how to fix these two things and about other accessibility features in Power BI, please see Microsoft's article on creating accessible reports.