Channel API has not been working correctly for hours.
The team is aware of this issue, and working on a fix. We'll update
this thread accordingly.
We apologize about the inconvenience you may have.
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Takashi Matsuo | Developer Advocate | tma...@google.com
The issue with channel API was fixed at around 1:30am Sep 15 Pacific.
A detailed postmortem will be coming next week.
Thanks for the patience.