I have installed KNIME 5.10. After installing KNIME AI Extensions I was about to use KNIME Open AI Authenticator and LLM Prompt but I could not find it in my nodes repository. I have tried the following:
Download the zip file and use the executable again and repeat the installation of the extension.
Uninstalled and installed KNIME AI Extensions but no use.
Uninstalled the KNIME AI Extension, Drag and dropped the node from the KNIME Community Hub and installed it again, still error.
If your organization has direct KAP installation blocked, extensions may also be blocked. Have you tried to install other extensions? This might help determine whether the problem is generic or just with the AI extension.