Comment 2 for bug 1913204

CentOS 8.3 is not actually compatible with 8.2 as they have different repo names and some other things, that made us drop 8.2 support in favor of 8.3. However without actually errors it's hard to understand if it is the case for you.
However if you followed the guide, dnf upgrade should have brought you 8.3 anyway.

So please provide us with the actual errors you've faced during deployment.