Why is Get-MessageTraceV2 Not Recognized?

I'm updating a script for pulling message traces in Exchange Online, and I've been told that the old Get-MessageTrace cmdlet will be deprecated soon. I need to switch to Get-MessageTraceV2, but every time I try to run it, I get an error saying the command isn't recognized.

Here's the script I'm using:

```powershell
# Connect to Exchange Online
Connect-ExchangeOnline -ShowBanner:$False

# Set dates for the mail trace
$startDate = (Get-Date).AddDays(-7).ToString("MM/dd/yyyy")
$endDate = (Get-Date).ToString("MM/dd/yyyy")

# Parameters for mail trace
$params = @{
StartDate = $startDate
EndDate = $endDate
SenderAddress = "[email protected]"
Status = "Failed"
}
Get-MessageTraceV2 @params
```

I've confirmed that I have the ExchangeOnlineManagement module 3.8 installed, which should support this cmdlet since it was introduced in version 3.7. But when I try `Get-Command Get-MessageTraceV2`, I get the same 'not recognized' error. Even when I search with `Get-Command *V2`, I only see cmdlets for Microsoft.Graph, nothing related to ExchangeOnlineManagement.

I've also attempted uninstalling and reinstalling the module, and tested it on a fresh system without the module installed. What am I missing?