aws-system-manager-automation-unencrypted-to-encrypted-resources
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ec2:AttachVolume steps fail with timeout
Either steps involving ec2:AttachVolume (attachNewEBSVolume and attachOriginalVolume) fail with a timeout, leaving the instance in a inconsistent state, as it ends up without any volume attached.
One solution it to change the SSM document to increase the timeout of both these steps to 300 instead of 180.