0xC004C020 and 0xC004F074: the ESU key is out of activations, or no KMS answered
0xC004C020 means the MAK is out of activations; 0xC004F074 that no KMS host answered. Activate ESU with its own Activation ID, and check the base licence.
0xC004F074: the Windows Server hosting Exchange cannot reach a KMS host
0xC004F074 leaves the Windows Server hosting Exchange unactivated and nagging. Learn the KMS and DNS checks and the licence that ends it for good.
Office 0xC004F074: no Key Management Service host could be contacted
Office error 0xC004F074 means the client found no reachable KMS host. See the DNS, firewall and licensing causes plus the fix for each one.
0xC004F074 and 0x8007232B: No KMS Host Could Be Found on Your Network
Windows shows 0xC004F074 when the client cannot find a KMS host in DNS. See why the _VLMCS SRV record fails and the exact commands that fix it.