Apple Watch turns my iPhone notification sounds off

Notifications appear on your Apple Watch or iPhone, but not both. If your iPhone is unlocked, you get notifications on your iPhone instead of your Apple Watch. If your iPhone is locked or asleep, you get notifications on your Apple Watch, unless your Apple Watch is locked. For more info, see:

Notifications on your Apple Watch - Apple Support

If you would like to make a feature request to Apple, use this link:

Product Feedback - Apple

This is not an acceptable solution.

Turning off wrist detection affects these Apple Watch features:

• When you use Apple Pay on your Apple Watch, you’ll be prompted to enter your passcode when you double-click the side button to authorize the payment.
• Some Activity measurements are unavailable.
• Heart rate tracking and notifications are turned off.
• Apple Watch will no longer automatically lock and unlock.
• Apple Watch SE and Apple Watch Series 4 and later wonʼt automatically make an emergency call even after it has detected a hard impact fall.

In other word if you want notifications on your iphone, it transforms your Apple Watch into a cheap wristband but with a ridiculous battery life.

TheSchmurtz wrote:

This is not an acceptable solution.

It's not intended as a solution. It's a workaround. Your watch is working the way it was designed to work. You want your watch to work in a way Apple doesn't intend so there really is no "solution".