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Bulk API issue updating Autonumber field

I'm having issues when using the Bulk API to upsert records with an Autonumber field. The field in question is the Name field on a custom object, which has a datatype of Autonumber.

I wouldn't expect to have to pass a value for an Autonumber field but I get the following error:
MISSING_ARGUMENT:Name not specified:

If I pass a value for the autonumber field I get the following message:
INVALID_FIELD_FOR_INSERT_UPDATE:Unable to create/update fields

Any idea of what the issue might be, should I be passing a value at all?
Danish HodaDanish Hoda
Please check if there is any old method /Constructor which is still having Name parameter.
This is just a custom object, there is no Apex class around it with a constructor?
Danish HodaDanish Hoda
Please share your code