Adding new gateway to Airvantage error

I am adding a new gateway to Airvantage. SIM is in inventory state. I verified its in the inventory state

Error 400 is received when doing a post on

gateway.not.unique.identifiers “errorParameters”:[“my fx30 imei”,“my fx30 fsn”]}

There is no fsn serial# or IMEI matching my fx30s in airvantage. Any ideas ?

Is it 2nd hand device?
have you contacted the support team?