Exchange 2019 Product Key Invalid 🔔

Set-ExchangeServer -Identity "EXCH01" -ProductKey "XXXXX-XXXXX-XXXXX-XXXXX-XXXXX"

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Run the following command to apply the product key to a specific server: powershell exchange 2019 product key invalid

(A domain trust issue can cause licensing validation to fail.)

: Trying to use a Standard Edition key on an Enterprise installation, or vice versa. Better yet, copy the key directly from VLSC

If all else fails, you may have a legitimate key issue:

Re-enter the key carefully. Better yet, copy the key directly from VLSC and paste it into the EAC. To paste into the product key field, use Ctrl + V or right-click. While Exchange starts in a 180-day trial mode,

Microsoft support often recommends reinstalling using the specific ISO downloaded from the Microsoft Volume Licensing Service Center (VLSC) rather than a general public download.

While Exchange starts in a 180-day trial mode, specific Cumulative Updates (CUs) may behave differently during the licensing handshake.

If your 180-day trial has expired, the server may behave unpredictably. While you can usually still enter a key, a reboot is often required to clear the "Trial Expired" state.