This script will search a windows system for the UserToRename user, if it exists, it will rename that account to the username who installed JumpCloud from the user portal

windowsRenameToProvisionerUser.ps1

################################################################################
# This script will pull the provisionerID from the JumpCloud console and rename
# the specified user account to the matching username in JumpCloud. This script
# will not rename or remap the user's home directory.
################################################################################

# Variables

# User to match and rename (case insensitive)
$UserToRename='oyo'
# API KEY
$JumpCloudApiKey = 'yourApiKeyHere'

# System Group IDs
# Before account rename group
$beforeRenameGroupID = 'replaceWithBeforeGroupID'
# After account rename group
$afterRenameGroupID = 'replaceWithAfterGroupID'
# Failure Group
$failureGroupID = 'replaceWithFailureGroupID'

################################################################################
# Get Local Accounts on system and see if UserToRename exists
################################################################################

$localUsers = Get-LocalUser
foreach ($username in $localUsers.name)
{
    if ($username -match $UserToRename){
        # Set Selected Username Variable
        write-host "Matched $UserToRename user found"
        $SelectedUser = $username
    }
}
if ([System.String]::IsNullOrEmpty($SelectedUser))
{
    throw "$username was not found on the system"
    # Add system to failure group & remove from before rename group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "add"
        'type' = "system"
    } | ConvertTo-Json
    Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$failureGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "remove"
        'type' = "system"
    } | ConvertTo-Json
    Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$beforeRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    exit
}
################################################################################
# Now try to match the Provisioner User from the System Record in JumpCloud
################################################################################
# Get System Key
$config = get-content 'C:\Program Files\JumpCloud\Plugins\Contrib\jcagent.conf'
$regex = 'systemKey\":\"(\w+)\"'
$systemKey = [regex]::Match($config, $regex).Groups[1].Value

$headers = @{
    Accept      = "application/json"
    'x-api-key' = $JumpCloudApiKey
    ContentType = 'application/json' 
}
$content = Invoke-WebRequest -Method Get -Uri "https://console.jumpcloud.com/api/systems/$systemKey" -Headers $headers -UseBasicParsing
if ($content.StatusCode -eq '200'){
    $systemResponse = $content.content | Convertfrom-Json
}

# This should be the provisionerID value
$ProvisionerID = $systemResponse.provisionMetadata.provisioner.provisionerId
if ([System.String]::IsNullOrEmpty($ProvisionerID)){
    throw "ProvisionerID does not exist for this system record"
    # Add system to failure group & remove from before rename group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "add"
        'type' = "system"
    } | ConvertTo-Json
    $groupAdd = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$failureGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    # Finally add system to the completed group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "remove"
        'type' = "system"
    } | ConvertTo-Json
    $groupRemove = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$beforeRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    exit
}

# Get the user details
$content = Invoke-WebRequest -Method Get -Uri "https://console.jumpcloud.com/api/systemusers/$ProvisionerID" -Headers $headers -UseBasicParsing
$userResponse = $content.content | Convertfrom-Json

# This should be the provisioner username value
$ProvisionerUsername = $userResponse.username
# exit if this is null
if ([System.String]::IsNullOrEmpty($ProvisionerUsername))
{
    throw "ProvisionerUsername does not exist for this system record"
    # Add system to failure group & remove from before rename group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "add"
        'type' = "system"
    } | ConvertTo-Json
    $groupAdd = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$failureGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    # Finally add system to the completed group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "remove"
        'type' = "system"
    } | ConvertTo-Json
    $groupRemove = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$beforeRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    exit
}

write-host "######## User Details ########"
write-host "UserID: $provisionerID"
write-host "UserName: $ProvisionerUsername"
write-host "##############################"

################################################################################
# Finally attempt to change the username to ProvisionerUsername
################################################################################

# Change the local username to the new user
rename-localuser -name $SelectedUser -newname $ProvisionerUsername -ErrorVariable errortext
if ($errortext)
{
    throw "Could not set username, exiting..."
    $body = @{
        'id'   = "$systemKey"
        'op'   = "add"
        'type' = "system"
    } | ConvertTo-Json
    $groupAdd = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$failureGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    # Finally add system to the completed group
    $headers = @{
        Accept      = "application/json";
        'x-api-key' = $JumpCloudApiKey;
    }
    $body = @{
        'id'   = "$systemKey"
        'op'   = "remove"
        'type' = "system"
    } | ConvertTo-Json
    $groupRemove = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$beforeRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
    exit
}
else{
    write-host "$SelectedUser changed to $ProvisionerUsername"
}

################################################################################
# Group assignment
################################################################################

# If script was sucessful, remove from the command assignment group
$headers = @{
    Accept      = "application/json";
    'x-api-key' = $JumpCloudApiKey;
}
$body = @{
    'id'   = "$systemKey"
    'op'   = "remove"
    'type' = "system"
} | ConvertTo-Json
$groupRemove = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$beforeRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
# Finally add system to the completed group
$headers = @{
    Accept      = "application/json";
    'x-api-key' = $JumpCloudApiKey;
}
$body = @{
    'id'   = "$systemKey"
    'op'   = "add"
    'type' = "system"
} | ConvertTo-Json
$groupAdd = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systemgroups/$afterRenameGroupID/members" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing

# Bind the user to the system
$headers = @{
    Accept      = "application/json";
    'x-api-key' = $JumpCloudApiKey;
}
$body = @{
    'id'   = "$ProvisionerID"
    'op'   = "add"
    'type' = "user"
} | ConvertTo-Json
$userBind = Invoke-WebRequest -Method Post -Uri "https://console.jumpcloud.com/api/v2/systems/${systemKey}/associations" -Headers $headers -Body $body -ContentType 'application/json' -UseBasicParsing
# After reboot the username and fullname fields should be set in the UI