API to Schedule Social Media Posts - "channelKey missing?"


I’m trying to use the above to schedule social media posts. I’ve got all the correct data inputted and it keeps giving me the response of “channelKey cannot be empty”

Does anyone know what I’m missing? I’ve tried inputting that channel key in a few different spots - the original example doesn’t even suggest you need it for the input (you’d only get it in the output.

Any ideas - getting frustrated trying to figure this out :frowning: