My development team and me faced the problem of publishing place. When we publishing through the website and studio, error was displayed (look at the screenshot). This happens to every one of my developers who tries to publish a place.
IMG_20210803_094619_559|690x448
When contacting support, no one gave an exact answer.
What can be done in such situation?
It could be a poor Internet connection, Or an error in the studio files, I reccomend reinstalling roblox studio, and saving your game on a file, So roblox studio dosent delete your game while uninstalling 
If it continues to persist, you should save the game as a file and maybe come back to publish it later, especially after you check your internet or other issues that may be preventing Roblox from publishing your game.
i have expirinced the same issue maybe try saving it to a diffrent place because sometimes if you puplish it in a diffrent place it should fix it
I tried to do what you said. But, problem remain the same, and all other developers have the same error (we are 3 developers) that is, the error remains the same even if the place is copied and published in another. I’m just at a loss…
Publish the game as a separate place. Or simply do as it says and retry later on.
