Issues with updating a TrackedEntityInstance via DataMutation

I’m working on an embedded custom react application within DHIS2 - I have gone through the documentation from here - How to use the Data Query Playground | DHIS2 Developer Portal - and have been able to get a new Instance created in the system with no issues. My major issue is relating to the updates of trackedEntityInstances.

I have the following sample JSON - which will import via the import app:
{
“trackedEntityInstances”: [ {
“orgUnit”: “VgrqnQEtyOP”,
“trackedEntityInstance”: “HuZ5Kc4GSUe”,
“trackedEntityType”: “W9FNXXgGbm7”,
“attributes”: [{
“attribute”: “jv1fu2pDYKE”,
“value”: “01”
}, {
“attribute”: “zh91RcBXyEf”,
“value”: “2004-01-01”
}, {
“attribute”: “esA6f27JSQM”,
“value”: “55”
}, {

                "attribute": "ggdR2bH42l3",
                "value": "1"
            }, {
                "attribute": "Zb9icCay6Ka",
                "value": "0"
            }
        ]
    } 
]

}

When attempting to perform the update using this code below

const handleFormSubmit = async (event) => {
        event.preventDefault();

        const url = 'https://<URL>/api/trackedEntityInstances'; // 
        const jsonData = {
            trackedEntityInstances: [
              {
                orgUnit: 'VgrqnQEtyOP',
                trackedEntityInstance: 'HuZ5Kc4GSUe',
                trackedEntityType: 'W9FNXXgGbm7',
                attributes: [
                  { attribute: 'jv1fu2pDYKE', value: '01' },
                  { attribute: 'zh91RcBXyEf', value: '2004-01-01' },
                  { attribute: 'esA6f27JSQM', value: '55' },
                  { attribute: 'ggdR2bH42l3', value: '1' },
                  { attribute: 'Zb9icCay6Ka', value: '0' },
                ],
              },
            ],
        };
        
        try {
            const response = await fetch(url, {
              method: 'POST',
              headers: {
                'Content-Type': 'application/json',
              },
              body: JSON.stringify(jsonData),
            });
      
            if (response.ok) {
              const data = await response.json();
              setResponseMessage('Data uploaded successfully!');
              console.log(data);
            } else {
              setResponseMessage('Failed to upload data');
              console.error('Error:', response.statusText);
            }
          } catch (error) {
            setResponseMessage('An error occurred while uploading data');
            console.error('Error:', error);
          }
    };

going via Post I am getting a "Unexpected token ‘<’, "<!DOCTYPE “… is not valid JSON” error.

Alternately I have attempted to just do a dummy update with the same data using the UseDataMutation methods in @dhis2/app-runtime. As shown below:

{
const [responseMessage, setResponseMessage] = useState(‘’);

const mutation = {
resource: ‘trackedEntityInstances’,
type: ‘update’,
data: {
trackedEntityInstances: [
{
orgUnit: ‘VgrqnQEtyOP’,
trackedEntityInstance: ‘HuZ5Kc4GSUe’,
trackedEntityType: ‘W9FNXXgGbm7’,
attributes: [
{ attribute: ‘jv1fu2pDYKE’, value: ‘01’ },
{ attribute: ‘zh91RcBXyEf’, value: ‘2004-01-01’ },
{ attribute: ‘esA6f27JSQM’, value: ‘55’ },
{ attribute: ‘ggdR2bH42l3’, value: ‘1’ },
{ attribute: ‘Zb9icCay6Ka’, value: ‘0’ },
],
},
],
},
};

const [mutate, { error, loading }] = useDataMutation(mutation);

const handleFormSubmit = async (event) => {
event.preventDefault();
try {
const response = await mutate();

  if (!response || (error && error.length > 0)) {
    setResponseMessage('Failed to upload data');
    console.error('Error:', error);
  } else {
    setResponseMessage('Data uploaded successfully!');
    console.log(response);
  }
} catch (error) {
  setResponseMessage('An error occurred while uploading data');
  console.error('Error:', error);
}

Going this route - I’m getting an Method not allowed

Can anyone advise on where I can find simple details of an update of an TrackedEntityInstance via the UseDataMutation - even an example via GitHub that I can compare where I’m going wrong.

If I update the type: ‘update’, to type: ‘create’, it runs without issue.

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