We want to test auto renewable subscription in the sandbox.
On my personal iPhone is my personal production account. On my personal iPhone is a sandbox account.
But: When I want to buy subscription in the sandbox on the watch, then the watch shows the error: "Buying the app is not possible. Login with your iPhone with the Apple Watch App with your Apple-ID."
When I take a look in the watchApp --> General --> AppleId then I see my production account.
QUESTION: How can I use the sandbox Account to test subscription?