The KMS machine count is less than the limit required by this rule. The limit defined in this rule is not the same as the minimum count required to sustain activations (which can differ). This rule provides an early warning system of a potential problem. If the KMS count never reaches the required value for activation or drops below it, machines will be unable to activate with this KMS.
The number of incoming activations or renewals is not enough to sustain the required machine count.
Ensure that the total number of KMS clients is sufficient to satisfy at least the minimum required activation count for each KMS machine you have enabled. Ensure the Renewal Interval has not been set too high. This information is obtained by running slmgr.vbs -dli.