I am trying to integrate Immersive Reader into an existing system.
I am successfully generating and passing an access token (as far as I can tell).
IR is launching with the text specified, and some functionality like breaking up syllables and line focus work.
However, other functionality like reading and translation are not. When I click the "Play" button, I get a message that says "Sorry, we couldn't download the audio file needed to read this text out loud. Status: 401".
I can see in the Network calls that a few of my IR calls are succeeding, but most are failing with 401s.
Are these failures an indication that there is a problem with my token, although IR does launch? I've scoured the docs and Q&A here and on SO for help, but I'm not seeing any help there.