Why does it ask for new auth code even when i got a new one just secs ago ?

Tried to login through my API, but keep on getting this error that the authorisation code has expired. I tried again few times but still I keep on getting the same message. I can login normally in the browser but not through API. Don't understand what is the issue here. Some clarity/guidance on this would be appreciated.

Thankyou

P.S: What does code -413 mean ?

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