‘t3a.xlarge’ cannot be use here because it is a burstable performance instance. Burstable performance instances are the only instance types that use credits for CPU usage.
According to Cluster placement group rules and limitations in this doc: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/placement-groups.html#concepts-placement-groups Instances in a cluster placement group cannot be burstable performance instances.
Here is a list of burstable performance instance types: https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/burstable-credits-baseline-concepts.html
Let us know if it helps
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