find the subcribed date of a license per user

Hello Pierre-Yves, To retrieve historical license information, including subscription and end dates, you can use PowerShell and Microsoft Graph API. Here is a basic outline of the steps you can follow:

### Prerequisites:
1. Ensure you have the required permissions to access Microsoft Graph API.
2. Install the MSOnline module for PowerShell (if not installed).

### PowerShell Script:
```powershell
# Install the MSOnline module (if not installed)
# Install-Module -Name MSOnline -Force -AllowClobber

# Import MSOnline module
Import-Module MSOnline

# Connect to MSOnline
$credential = Get-Credential
Connect-MsolService -Credential $credential

# Get all users
$users = Get-MsolUser -All

foreach ($user in $users) {
$userPrincipalName = $user.UserPrincipalName

# Get license information for the user
$licenses = Get-MsolUser -UserPrincipalName $userPrincipalName | Select-Object -ExpandProperty Licenses

foreach ($license in $licenses) {
$serviceName = $license.AccountSkuId
$subscribedDate = $license.SubscribedPlans[0].AssignedTimestamp
$endDate = $license.SubscribedPlans[0].ExpiryTimestamp

# Output the information (you can modify this part as needed)
Write-Output "User: $userPrincipalName, Service: $serviceName, Subscribed Date: $subscribedDate, End Date: $endDate"
}
}

# Disconnect from MSOnline
Disconnect-MsolService
```

### Notes:
- Modify the output section based on your reporting needs.
- Ensure you have the necessary permissions to execute these commands.
- Make sure to handle authentication securely, especially if you plan to schedule or automate the script.

This script uses the MSOnline PowerShell module to connect to MS 365 and retrieve license information for each user. You may need to adjust it based on your specific requirements and environment.

Remember to test the script in a safe environment before running it in production. Additionally, Microsoft Graph API may provide more advanced capabilities for historical data, but it requires more complex authentication and permission handling.

Have a great day lo Pierre-Yve!