Can i ask a question?
How to fix this “Changing game build failed”
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Well, this message is certainly never something I have ever seen, all I could possibly tell you is that I faced a similar issue where it would say “Changing game build failed: an unknown error occurred” and what fixed it for me was a clean install of FiveM.
This was the guide that I followed: HOW TO UNINSTALL THE FIVEM AND INSTALL AGAIN !! - YouTube (4 years old but still works)