installed Fedora-Server-dvd-ppc64le-31_Beta-1.1.iso on a power8 PowerVM instance.

The Installation itself was smooth but any attempt to install additional packages failed with:

# dnf install gcc
Fedora Modular 31 - ppc64le - Test Updates       80 kB/s |  54 kB     00:00    
Failed to download metadata for repo 'updates-testing-modular'
Error: Failed to download metadata for repo 'updates-testing-modular'

I am not sure what is expected at this point in the process.