Recently Apple has deprecated subscriptions property availableInAllTerritories from the resource 'subscriptions'"
Post this, You are not able to update prices to the subscription.
As availableInAllTerritories is not set for new subscription.
So you have to enable availableInAllTerritories manually to change the prices.
So the steps listed in https://developer.apple.com/documentation/appstoreconnectapi/app_store/auto-renewable_subscriptions/managing_auto-renewable_subscriptions will not work out of box.
