I'm on Monterey 12.0, on an Intel Mac, with extension v2.1.0, and I have the same kextload 'code signature' error. bash-3.2# kextload /Library/Apple/System/Library/Extensions/RemoteVirtualInterface.kext Executing: /usr/bin/kmutil load -p /Library/Apple/System/Library/Extensions/RemoteVirtualInterface.kext Error Domain=KMErrorDomain Code=29 "Authenticating extension failed: Kext com.apple.nke.rvi v2.1.0 in executable kext bundle com.apple.nke.rvi at /Library/Apple/System/Library/Extensions/RemoteVirtualInterface.kext: Authenticating extension failed: Bad code signature" UserInfo={NSLocalizedDescription=Authenticating extension failed: Kext com.apple.nke.rvi v2.1.0 in executable kext bundle com.apple.nke.rvi at /Library/Apple/System/Library/Extensions/RemoteVirtualInterface.kext: Authenticating extension failed: Bad code signature} bash-3.2#

I finally managed to make it work on Intel Mac That's dirty, but it works : you need to disable SPI. So in recovery mode, open terminal and type : csrutil disable Reboot, then try to load the extension manually : sudo kmutil load -p /Library/Apple/System/Library/Extensions/RemoteVirtualInterface.kext That should popup something that redirect to System Settings where you need to agree on using an extension from à mighty developper called "Apple Inc." Then reboot. Then reloading manually the extension will be ok, and rvictl -s UUID also ! Yes, that is dirty, but until this extension signing is solved, I'm afraid I have no other choice ...