How to re-register a managed node in AWS Systems Manager?

Hi. I have recently been using AWS Systems Manager (SSM) with a Greengrass core device to execute shell commands remotely from the AWS console. I was successful in executing the shell commands and proceeded with de-registering the managed node due to the fact that the SSM documentation clearly states that "You can reregister an on-premises server, edge device, or VM again at any time. Systems Manager stores the command history for a deregistered managed node for 30 days". I wanted to re-register the same managed node but am unsure how to go about doing this. I tried navigating around the SSM console and even looked in the API reference to see if there was an AWS CLI command to execute to re-register a node. I also tried redeploying the Greengrass components but all these attempts were unsuccessful. Am I missing something here? Any assistance or at least a nudge in the right direction would be greatly appreciated.