I was able to make it work by inserting the X-CSRF-Token as a header. <code> $uri = $BaseURL + "/controller/auth?action=login" Invoke-WebRequest -uri $uri -headers $Headers -SessionVariable WebSession | out-null $Uri = $BaseURL + "/controller/restui/dashboards/getAllDashboardsByType/false" if (-not $headers.ContainsKey("X-CSRF-Token")) {     $XCSRFToken = $WebSession.Cookies.GetCookies($uri) | Where-Object { $_.Name -eq 'X-CSRF-Token' } | Select-Object -First 1 -ExpandProperty Value     $Headers.Add("X-CSRF-Token", $XCSRFToken) } $Result = Invoke-RestMethod -Uri $Uri -Headers $Headers -WebSession $WebSession </code> ... View more