Hello, I am trying to publish my template. However, it keeps on saying "not found" or "unauthorized, please try again".

When I go to settings and then templates it says "update" but then when I press publish changes, it doesn't work and keeps saying either Unauthorized or Not found over and over again. I tried going incognito mode, refreshing multiple times, updating my website many times, and other things like that. Any help would be highly appreciated, thank you!

The error message: