Airtable API POST to Single Select Field

Hello,

I would like to create a record via the API. In my table, I have a Single Select Field. It is linked with another table’s data (e.g. north, south, east, west). I am having some issues and errors when trying to POST via the API on this field (422). I see in the API it should be posted in an array, but still no luck selecting this field dynamically and setting data from the other table.

Any ideas or help will greatly appreciated.