I think there's somthing wrong with the login url!

[mahmoudshoaala]

Invoke-WebRequest : {"error":"unauthorized_client","error_description":"AADSTS700016: Application with identifier '60198040-e87c-4cb9-9e52-ce651d859704' was not found in the directory 'My Tenant ID'. This can happen if the application has not been installed by the administrator of the tenant or consented to by any user in the tenant. You may have sent your authentication request to the wrong tenant.\r\nTrace ID: ef74e440-ce52-4830-8c9a-5d5a42013f00\r\nCorrelation ID: 091b1b89-9ae1-4b1c-9242-39899e611fc4\r\nTimestamp: 2021-03-12 20:10:09Z","error_codes":[700016],"timestamp":"2021-03-12 20:10:09Z","trace_id":"ef74e440-ce52-48 30-8c9a-5d5a42013f00","correlation_id":"091b1b89-9ae1-4b1c-9242-39899e611fc4","error_uri":"https: //login.microsoftonline.com/error?code=700016"} At C:\Users\Hanafi\Desktop\GetGraphUserStatisticsReport.PS1:27 char:17

• ... enRequest = Invoke-WebRequest -Method Post -Uri $uri -ContentType "ap ...

• 
  + CategoryInfo          : InvalidOperation: (System.Net.HttpWebRequest:HttpWebRequest) [Invo 
  ke-WebRequest], WebException
  + FullyQualifiedErrorId : WebCmdletWebResponseException,Microsoft.PowerShell.Commands.Invoke 
  WebRequestCommand
  ConvertFrom-Json : Cannot bind argument to parameter 'InputObject' because it is null.
  At C:\Users\Hanafi\Desktop\GetGraphUserStatisticsReport.PS1:30 char:35

• $token = ($tokenRequest.Content | ConvertFrom-Json).access_token

• 
  + CategoryInfo          : InvalidData: (:) [ConvertFrom-Json], ParameterBindingValidationExc 
  eption
  + FullyQualifiedErrorId : ParameterArgumentValidationErrorNullNotAllowed,Microsoft.PowerShel 
  l.Commands.ConvertFromJsonCommand

[12Knocksinna]

The app you're trying to use doesn't have the right app id. Did you create an app in Azure AD and give it the right permissions?