Old Apple Watchs couldn’t update to Wathos 10 to the latest version!
Watchos 10 -installed Apple Watch SE 1, Series 4 or Series 5 models are currently not updated to the Watchos 10.6.1 version. In addition, some Apple Watch models that run older versions of Watchos 10 cannot be matched with the iPhone.
This problem only affects the Apple Watch models that support the Watchos 10 and are experienced by users who have not updated their devices to the WATCHOS 10.6.1 version.