Bitlocker script not working

[ildrososgr]

Hello has anyone run the script successfully ?
After following the instructions and running the script like this :
.\Get-IntuneManagedDeviceBitLockerKeyPresence.ps1 -TenantID "xxxxxxxxxxxx" -ClientID "yyyyyyyyyy" -State NotPresent -Verbose

This returns all of my devices .
If run with state Present it returns none.

[adelamora-vtsf]

I cannot use this script, it returns errors on both getting the auth token, and retrieving data.
At first I get this error:
See https://aka.ms/msal-net-invalid-client for details. Original exception:
AADSTS7000218: The request body must contain the following parameter: 'client_assertion' or 'client_secret'.

When I modify the script to provide a client secret, I then get this error:

VERBOSE: GET https://graph.microsoft.com/Beta/bitlocker/recoveryKeys?$select=id,createdDateTime,deviceId
VERBOSE: Existing token found but has expired, requesting a new token
WARNING: Unhandled error occurred in function. Error message: You cannot call a method on a null-valued expression.
VERBOSE: GET https://graph.microsoft.com/v1.0/deviceManagement/managedDevices?$filter=operatingSystem eq
'Windows'&select=azureADDeviceId&$select=deviceName,id,azureADDeviceId
VERBOSE: Existing token found but has expired, requesting a new token
WARNING: Unhandled error occurred in function. Error message: You cannot call a method on a null-valued expression.

[adharrissr1914]

Getting Message After Tenant and Client ID verified.
WARNING: Unhandled error occurred in function. Error message: You cannot call a method on a null-valued expression.