Accessibility Functionality not working in Repear

Hey Guys,
I have built an accessible synthesiser in Juce for my dissertation; I have tested the functionality and got it to work inside Ableton and in the plugin host without any problems. However, most of my testers are using Repear with OSARA, and nothing is working if I load it as a VST; when I pass focus to an object even though mouse movement nothing is being passed to the screen reader at all. Is there anything that needs to be approached differently for Reaper? I’m mainly just using grab focus to provide a lot of the accessibility?

Best,

Kris