URGENT! getting error response saying {"kind":"SessionError","description":"missing or invalid session

When we call createTalk API, we get the error response saying {"kind":"SessionError","description":"missing or invalid session_id"}
But when we checked the API payload we can see the session_id was passed in it.

It happens only sometimes. If it happens, the error continues for hours.

This is killing our Christmas-related project. URGENT assistance needed please

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URGENT! getting error response saying {"kind":"SessionError","description":"missing or invalid session_id"}