Manually inspect the string to ensure there are no leading or trailing spaces.
When copying and pasting the key, invisible trailing spaces or "hidden" formatting characters often get pasted into the input box, causing an immediate rejection.
: Glitches in the EAC web interface, particularly when using browsers other than Internet Explorer (or Edge in IE mode), can cause the validation to fail. Media vs. Key Mismatch exchange 2019 product key invalid
If the server is already licensed (even with a trial key), you must use the specific PowerShell command to overwrite the existing key. The GUI sometimes fails to notify you that it simply didn't overwrite the old one.
Set-ExchangeServer -Identity "YourServerName" -ProductKey "XXXXX-XXXXX-XXXXX-XXXXX-XXXXX" Use code with caution. Manually inspect the string to ensure there are
You have a valid Standard Edition product key, but you previously installed the Enterprise Edition (or vice versa). You cannot downgrade or cross-grade with a key. To switch editions, you must normally perform a recovery installation or uninstall/reinstall.
There are several reasons why your Exchange 2019 product key may be invalid: Media vs
: Use the following syntax, replacing with your actual server name and with your 25-character key:
If you are upgrading from Evaluation to Standard or Standard to Enterprise, use the official Microsoft documentation to ensure the command Set-ExchangeServer is used correctly. 3. Restart Exchange Information Store Service
Here is a guide on troubleshooting this issue, followed by a script designed to help you diagnose the problem quickly.