A. An appropriate instance profile that contains the AmazonSSMManagedInstanceCore policy is not assigned to the EC2 instances.
B. The EC2 instances are attached to a security group that has an outbound rule that does not explicitly allow port 443.
C. Systems Manager Agent (SSM Agent) is not installed on the EC2 instances.
D. The AWS Data Provider for SAP agent is not installed on the EC2 instances.
E. Amazon CloudWatch detailed monitoring is not turned on for the EC2 instances.

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