Fitbit reports 400 responses on Subscriber endpoint

[RoxanaF]

Fitbit Team,

All of a sudden today, our app was disabled twice today (email states: "Your application Devices has been configured to use the Fitbit Subscriptions API. It was failing to respond properly to notification requests from the Fitbit API, so your subscriber was disabled. "). I have verified our subscriber Details and I can see a Failed requests were made and the "Response Code/Exception" is 400. Has anything changed on Fitbit side lately?? Our subscription endpoint only returns 204 (NoContent) at all times and even in cases of excption, we handle them and return 204. At no point in the code we return 400. I am confused where the Response is coming from, unless something has changed on Fitbit side and the requests are malformed.

Could you please assist as this is affecting a wide area of our application.

Thank you, Roxana

[JeremiahFitbit]

@RoxanaF: Please send me your client id in a private message.