Public/set-AllegisSnowUsername.ps1

function set-AllegisSnowUsername 
{
Param([Parameter(Mandatory = $true)]
    [string]$snowEnv, 
    [pscredential]$snowCred, 
    [ValidateLength(32,32)]
    [string]$usersysid, 
    [ValidatePattern("(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|`"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*`")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)\])")]
    [string]$upn
)
    $uid=$upn.Substring(0,$upn.IndexOf('@'))
    $snowtable='sys_user'
    $user = $snowcred.username
    $pass = $snowcred.GetNetworkCredential().password
    $method = 'put'
    
    $uri = "https://$snowEnv.service-now.com/api/now/table/$($snowtable)/$usersysid"
    $command="`$base64AuthInfo = [Convert]::ToBase64String([Text.Encoding]::ASCII.GetBytes((""{0}:{1}"" -f '$user', '$pass')))
    `$headers = New-Object ""System.Collections.Generic.Dictionary[[String],[String]]""
    `$headers.Add('Authorization',('Basic {0}' -f `$base64AuthInfo))
    `$headers.Add('Accept','application/json')
    `$body=`"{'u_nick_name':'$uid','email':'$upn','user_name':'$upn'}`"
    `$response=Invoke-RestMethod -Headers `$headers -Method '$method' -Uri '$uri' -UseBasicParsing -FollowRelLink -body `$body #-MaximumFollowRelLink 2
    return `$response.result | convertto-json
    "

    $bytes = [System.Text.Encoding]::Unicode.GetBytes($command)
    $encodedCommand = [Convert]::ToBase64String($bytes)

    $results=& 'C:\Program Files\PowerShell\6\pwsh.exe' -encodedcommand $encodedCommand
    $json=$results | convertfrom-json
    return $json
}