Exchange 2019 Product Key Invalid

Exchange 2019 uses a 25-character key in the format:
XXXXX-XXXXX-XXXXX-XXXXX-XXXXX

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Exchange product keys are version-specific. An Exchange 2016 key will not activate Exchange 2019. exchange 2019 product key invalid

Solution: Confirm you have a genuine Exchange 2019 key. Check your Microsoft Volume Licensing Service Center (VLSC) or partner portal. If you only have an Exchange 2016 key, you need to upgrade your licensing. Exchange 2019 uses a 25-character key in the

If all else fails, you may have a legitimate key issue: Exchange product keys are version-specific

In your deployment script (PowerShell DSC or Ansible), include:

if ((Get-ExchangeServer).IsLicensed -eq $false) 
    Set-ExchangeServer -Identity $env:COMPUTERNAME -ProductKey "YOUR-KEY-HERE" -ErrorAction Stop
    Restart-Service MSExchangeADTopology