Deployment failure on fahclient-setup

[blakegearin]

Error I'm seeing:

The resource write operation failed to complete successfully, because it reached terminal provisioning state 'Failed'.

 (Code: ResourceDeploymentFailure, Target: /subscriptions/{redacted}/resourceGroups/fold-at-home-2/providers/Microsoft.Compute/virtualMachines/fahclientVM/extensions/fahclient-setup)

{
    "status": "Failed",
    "error": {
        "code": "VMExtensionProvisioningError",
        "message": "VM has reported a failure when processing extension 'fahclient-setup' (publisher 'Microsoft.Azure.Extensions' and type 'CustomScript'). Error message: 'Enable failed: failed to execute command: command terminated with exit status=127\n[stdout]\n\n[stderr]\n/bin/sh: 1: FxJ#T: not found\n'. More information on troubleshooting is available at https://aka.ms/VMExtensionCSELinuxTroubleshoot. "
    }
}

I've tried with VM size Standard_F4s_v2 and Standard_F2s_v2. The default Standard_NV6 does not appear to be a viable option with the free Azure credits anymore.