SvelteKit proxy failing on POST /api/v2/oauth/clients

NICE CXone API & Integrations
1

{"status": "error", "code": "400", "message": "Invalid request body"}

Okay, so the SvelteKit server route is acting as the proxy.
It’s there to keep the CLIENT_SECRET away from the browser.
The frontend sends the data to the server, then the server calls the API.
Basically, it’s a SECURITY layer so we don’t leak credentials.
Trying to hit POST /api/v2/oauth/clients but it’s FAILING.

const response = await fetch('https://api.mypurecloud.com/api/v2/oauth/clients', {
 method: 'POST',
 headers: {
 'Authorization': `Bearer ${token}`,
 'Content-Type': 'application/json'
 },
 body: JSON.stringify(clientData)
});

The clientData object is formatted exactly as the spec wants.
I’ve tried clearing the session and refreshing the token.
STILL getting a 400.

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