FactorialHR creating a New Leave errors with 404

Hey there :v:
I am tinkering around with Google Spreadsheets and FactorialHR.
I basically want to monitor a sheet for new records and create a new leave for each row in the gsheet.

I can successfully connect to factorial from make to e.g. list users in factorial however when trying to create a new leave i’ll always receive the following error:

Not quite sure how to fix this. I tried with an API Key ceated from the default factorial page and with an API key retrieved from a factorial developer account.

Any help is much appreciated. I’m probably just missing something minor.

cheers,
Tony