Exchange 2019 Product Key Invalid -

Run the following command in as Administrator:

Microsoft has phased out the generic 120-day trial key for Exchange 2019. For permanent installations, you must use a genuine VL key or contact your Microsoft licensing partner. exchange 2019 product key invalid

If the issue persists after trying the above, open a support case with Microsoft Volume Licensing Support. Run the following command in as Administrator: Microsoft

If using Exchange 2019 RTM or CU1–CU11, download the latest Cumulative Update 14 (CU14) or newer from the Microsoft Download Center. Newer CUs have better key handling. exchange 2019 product key invalid

Set-ExchangeServer -Identity "SERVERNAME" -ProductKey "XXXXX-XXXXX-XXXXX-XXXXX-XXXXX" Then restart the Exchange services or reboot.