Activation error

0xC004F038

The count reported by your Key Management Service (KMS) is insufficient

The KMS host's activation count has not reached the minimum needed to issue licenses. KMS requires a threshold of unique clients before it activates anything: 25 for Windows client editions and 5 for Windows Server. Below the threshold, every activation request is refused with this code.

Symptoms

Error: "The count reported by your Key Management Service (KMS) is insufficient. Please contact your system administrator"
KMS activation works for some clients but not others on the same host
A newly stood-up KMS host refuses all activation requests

Causes

The KMS host's current count is below the activation threshold (25 for client, 5 for Server)
The KMS pool is small — lab or branch environments often sit just under the threshold
Clients are pointed at the wrong KMS host that never accumulates a count for their product

How to fix it

Check the current KMS count

On the KMS host run slmgr.vbs /dli. The "Current count" line shows how many unique clients have contacted it; compare against the 25 (client) / 5 (server) threshold.

Add computers to the KMS pool

Microsoft's documented fix is to add more computers to the pool — each unique client that contacts the host raises the count. In labs, pointing additional test VMs at the host is the usual approach.

Force clients to request activation

On each client run slmgr.vbs /ato to trigger an activation request now rather than waiting for the scheduled attempt. Each request from a unique machine counts toward the threshold.

Verify clients hit the right host

Run slmgr.vbs /dlv on a client and check the KMS machine name it last contacted. If clients are split across two hosts, neither reaches the threshold — consolidate them onto one.

Still need help?

If error 0xC004F038 keeps blocking activation after these steps, our support team can check your key and license channel directly.

Contact support

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