2019 Product Key Invalid |verified| | Exchange

Get-ExchangeServer | fl IsLicensed, EvaluationEndDate

If PowerShell also fails, check for these common underlying issues: exchange 2019 product key invalid

A common issue is the EAC reporting a key as invalid even when it is correct. Using PowerShell often bypasses this GUI error: Get-ExchangeServer | fl IsLicensed

: Verify that your key matches the installed edition (Standard vs. Enterprise). A Standard key cannot activate an Enterprise installation, though an Enterprise key can often upgrade a Standard one. Typographical Errors EvaluationEndDate If PowerShell also fails