Unable to update subscription price

[DrySs]

Hi there,

I'm trying to update a Subscription price, using the route http://v1/billing/subscriptions/:subscription_id with this body:

[
    {
        "op": "replace",
        "path": "/plan/billing_cycles/@sequence==1/pricing_scheme/fixed_price",
        "value": {
            "currency_code": "EUR",
            "value": "21.00"
        }
    }
]

After executing this request, API return me a 204 with no content.

But when I refresh the Paypal Dashboard, the price still remains at the old value and is not updated.

How to update a Subscription price using Rest API?

Thanks,

Philippe