Hello Sue,
I am sorry that you are having trouble integrating with Wordpress. Although I have not personally had issues with WordPress LearnDash LMS and WCAG compliance, I can attest to both Storyline and Rise’s accessibility options.
Here are some useful links that I found that I thought may interest you:
Storyline 360: Adjustable Accessibility Settings
Storyline 360 Supports Web Content Accessibility Guidelines
Rise 360: Our Accessibility Journey
Rise 360 Supports Section 508 Accessibility Guidelines
Storyline 360 supports WCAG 2.1 Level AA, including screen readers, keyboard navigation, visible focus indicators, and more.
I hope this is helpful!