Apple Watch 8 - not able to update the watchOS
I cannot update my Apple Watch 8. When I try to update the Watch by using the Watch App (Settings -> Updates) on my Iphone 8, I get the information: "First update the Iphone". I go then to the settings of the Iphone, check for updates and it informs me that "the iOS is up to date (16.7.10)".
When I try to update the Watch directly in its settings I get en error message "it's not possible to check the availability of the latest updates. An error occured while checking the availability of the updates". So it's a vicious circle.
How can I update my Apple Watch 8? (The missing upate may be the cause that the Watch has stopped measuring the temperature over 2 months ago). Thank you in advance for your hints.
Apple Watch Series 8