Thanks for your response. The code uses live moderator tokens and all URLs point to the production environment. However, the production environment question got me double-checking. It appears that while several of the test code pointers pointed to "https://api.tokbox.com/hl/*", the API_SERVER value for production was set to "https://api.opentok.com/hl/*". Considering that these addresses could reference different subsystems, I tweaked the configuration so that all references point to the (latter) "opentok" address. In preliminary testing with my stripped-down code, this appears to have resolved the issue. Thanks again and please consider this issue resolved unless you hear back from me.
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