Problem installing CUD with dnf

Have downloaded CUDA rpm and working through the instructions from

In the last step, I run into a download problem from your repo:

sudo dnf -y install cuda-toolkit-12-3

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Updating Subscription Management repositories.
cuda-rhel9-x86_64 0.0 B/s | 0 B 02:00
Errors during downloading metadata for repository ‘cuda-rhel9-x86_64’:

What do I need to do to fix this?