Why does my Apple Watch say "Unable to verify update"?

Hi! What can I do if it always says "Unable to verify update. You are not connected to the internet" though I am connected to it? Also, I have tried different ways to update my Apple Watch SE2. I reset the watch and nothing still happened. I tried restarting both of my devices as well as our router. I even went to my friend's house to install the update, but, nothing happened. I tried to do the whole process again for like 10x now and still nothing happened. Also, I can't use the watch without installing the update so if I can't install the update it will be useless. What can I do now?

[Re-Titled by Moderator]