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I’ve done 15+ fresh installations of AlmaLinux 9.6 (Minimal) directly from the Netcup SCP.
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Every time, the installation finishes, but the server is not pingable and has no network access.
[…] and I urgently need to move data from another datacenter.
If you need to move data urgently, I'd suggest a workaround – temporarily use a LiveCD (e.g., AlmaLinux Live Media) or one of the numerous other images Netcup already offer (which should all work out of the box), boot that, make sure that your environment is secure, and then transfer the data (e.g., using separate Local Block Storage).
Afterwards, tend to the problem with your AlmaLinux installation (maybe on a second KVM instance). In any case, it's a good idea to create your own custom Rescue/Installation Image locally and use this for a fresh installation in order to ensure that you have complete control over your environments at any given time.