Orchestrator API get HTTP 400 ERROR


When i am trying to Add QueueItem through the Orchestrator API at my website, i got the 400 error for the works such as Add QueueItem, Get QueueItem, get RobotsID, get ReleaseKey, StartJobs.

But the Authenticate and GetQueueDefinition still work fine.

In fact, all these API functions works fine before yesterday…
It just suddenly get HTTP 400 error and we did not update any codes…

Can someone help? thank you~