I\'ve got some Google Sheet script code that I\'d like to extract into Google Sheet Addon to be published for just of our domain (not public web). Individuals on my team ha
Double check your version number - while in the script editor, click on 'File' and 'Project Properties'. I had the same problem. It turns out my error was entering the version name I had given my current version of the script (3.0), instead of the number Google had assigned to the current version of my script (3).
Once I entered '3' as the version number, I no longer got the error message "Project Key is not associated with current project or the script version doesn't exist ", and I was able to save.
I used the 'Project key (Deprecated)'.