I get a 500 Internal Server Error when trying to create a demographics field via the POST /d2l/a...

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I get a 500 Internal Server Error when trying to create a demographics field via the POST /d2l/api/lp/(version)/demographics/fields/ endpoint
 

The JSON I'm sending in the body via Postman is:

 

{

"Name": "IsEmployed",

"Description": "Are you employed?",

"DataTypeId": "{{$guid}}"

}