This might sound crazy - but they might actually want CentOS ^Stream 8 for some reason. I know... It's crazy, but there are fans of the changes made by Red Hat to CentOS. I am not one of them. No, no I am not. But, it's possible!
Have you even bothered to read the other replies? Let me summarize it for you, since you didn't.
CentOS 8 has been end of Life since 31-12-2021, you have two options:
1. Migrate to CentOS Stream 8