This page may help you to create Power BI reports that follow accessibility standards.
Whenever building a report, especially for public reports, you should create your reports to be usable by as many people as possible.
1. Ensure charts and text have sufficient color contrast
2. Use descriptive, purposeful chart titles
3. Avoid using color as the only means of conveying information
4. Set tab order on all visuals on each page
5. Remove unnecessary jargon and acronyms from all charts
Watching this "Techniques for accessible report design in Microsoft Power BI" video and reading these articles from the Microsoft site will help you understand more:
Design Power BI reports for accessibility
These tools are available for evaluating accessibility on the website. Download them on your browser and check the accessibility of your reports.