Don’t you have some meta tag definition somewhere (or headers) where you indicate the origin trial you are using on your app ?
Example:
Note: You will need one origin trial per domain name used to access your application. That’s why in my example there are twice per origin trial since we have two different domains to access our application.
But i guess your application was working before switching on the 1.9.9, is that correct ? Which version were you using before that ? I’m curious cause these two origin trial are almost mandatory since several weeks / months now, and should be used since version 1.9.0 if my memory is correct (for SIMD)
Another thing: what version of Chrome are you using for your tests ?
Could you check whether you have javascript errors when entering the meeting on your app ? (similar to what has been reported here for example and that would explain why you cannot join audio & video)