Apple watch 8 series is not compatible with Iphone 6s Plus

Greetings,

Just to let you know all. The apple watch 8 is not compatible with Iphone 6s plus and 7. Your new watch will work with Iphone 8 and above.

When trying to pair the watch with the phone, the watch wants to update its version and unpairing from the phone. The phone is with iOS 15.7

I had long discussion with apple support and no one could help me with a solution. At the end they told me to contact local apple supplier and support. They told me that the watch is compatible with Iphone 8 and above.

Unfortunately I had to return my brand new watch.