The MaxSpotInstanceCountExceeded error occurs when AWS Spot Service limits are reached, preventing additional Spot instances from being launched. This article outlines the reason for this error and steps to resolve it.

Receiving this error indicates that the AWS spot service limit has been reached and no additional spot instances can be launched. To resolve, you must open a support case with AWS to increase this limit. 

You will receive an email titled Spot Proactive Monitoring | Max Spot Instance Count Exceeded, which contains all the necessary information to open the support request with AWS, including the instance type and region that triggered the error.

The document below can be used to address capacity issues within your cluster/group:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-spot-limits.html