Receiving 415 Error when Updating Dataset through API

Hi,

I'm trying to upload some CSV data with Python and I feel like my data is formatted properly but I'm still getting a 415 error. This is what the data looks like and is set to a variable cvList.

"None","Auxiliary Copy","Running","92"
"vmidintrawfe01","Backup","Running","52"
"soepdfs02","Synthetic Full Backup","Running","47"
"None","Auxiliary Copy","Running","13"
"s001apporap01","Synthetic Full Backup","Running","23"
"None","Auxiliary Copy","Running","81"
"None","Auxiliary Copy","Running","97"

I was able to successfully create the dataset in the same script so I know the access_token is correct. This is what I'm using for this section of the code.

def UpdateDataset():
	# Put Dataset 
	# PUT https://api.domo.com/v1/datasets/{DATASET ID}/data
	print("Updating Domo Dataset")
	try:
		response = requests.put(
			url="https://api.domo.com/v1/datasets/{DATASET ID}/data",
			headers={
				"Authorization": access_token,
				"Accept": "text/csv",
			},
			data=cvList,
		)
		print('Response HTTP Status Code: {status_code}'.format(
			status_code=response.status_code))
		print('Response HTTP Response Body: {content}'.format(
			content=response.content))
	except requests.exceptions.RequestException:
		print('HTTP Request failed')

Anyone know why I'm seeing this? This is the 2nd dataset with which I'm having this same issue.