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    [SOLVED] Did "new installation" upgrade, subscription key no longer works, "Invalid: Invalid Server ID"

    I upgraded a proxmox 6 installation to proxmox 7 via the "new installation" method, i.e. I reloaded the machine from the proxmox 7 CD. When I inserted the subscription key, it did not authorize the system, and the status reads "Invalid: Invalid Server ID". From this, I am guessing that it...