Accidentally using a product key meant for Exchange 2013 or Exchange 2016.
Exchange Server saves its licensing data in the Active Directory (AD) configuration partition. If you enter the key on one Exchange server, but the local domain controller has not synced with the rest of the network yet, Exchange may view the key as invalid. Insufficient Active Directory Permissions
If you have multiple Domain Controllers, the license change might take time to propagate across your infrastructure. Open an elevated Command Prompt. Run the replication command: repadmin /syncall /Adep Use code with caution. Step 5: Restart the Exchange Information Store Service exchange 2019 product key invalid
Are you currently seeing a (like KEY_NOT_ACTIVATED ) or just the generic "invalid" message in the EAC?
Exchange Server 2019 comes in two primary editions: and Enterprise . Accidentally using a product key meant for Exchange
Verify the status is . If it is stopped, start it and attempt activation again. Important Considerations for Exchange 2019 Licensing
If the key continues to show as invalid, it is recommended to contact Microsoft Volume Licensing Support to verify the key's validity and associated product. If you'd like, I can: Tell you in the VLSC portal. Step 5: Restart the Exchange Information Store Service
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