Transcript button not accessible in NVDA Screen Reader

Hello all,

I work with a client who includes a transcript for all of their slides. We make this available in the Player by enabling the Transcript button, so the player looks like this:

I've just been doing some accessibility testing using the NVDA screen reader. Although I am able to tab through all other player options (play/pause, replay, etc. along the bottom, menu and slide titles at the side, and resources, info, and help at the top), the Transcript doesn't come up in the tab order.

How can I fix this? Is there somewhere to view/change the tab order/visibility assigned to the player features?

Thanks!

Delaney