Issue with AWS CodeDeploy Across Multiple Regions - Unable to Connect EC2 in Stockholm Region

Hello AWS Community,

I've been encountering a persistent issue while attempting to deploy applications using AWS CodeDeploy across several regions, including London, Frankfurt, and Stockholm. The problem persists across all these regions, but it's particularly acute in the Stockholm region, where I am unable to even establish a connection to an EC2 instance.

The recurring error message I encounter is: "CodeDeploy agent was not able to receive the lifecycle event. Check the CodeDeploy agent logs on your host and ensure the agent is running and can connect to the CodeDeploy server."

Here are the troubleshooting steps I've taken so far:

Verified that the CodeDeploy agent is installed and running on the hosts. Reviewed the CodeDeploy agent logs for errors, but found no clear indications that could resolve the issue. Confirmed that network firewalls are not blocking communication. Checked that necessary ports (443 for HTTPS) are open. Ensured that EC2 instances have the correct IAM role and policy for AWS CodeDeploy. Restarted the CodeDeploy agent. Checked that the server's time is synchronized with an NTP server. Reviewed the CodeDeploy agent's configuration file for any discrepancies. Despite these actions, the issue persists. I would greatly appreciate any guidance or suggestions to resolve this issue, especially in the Stockholm region where I can't even connect to EC2.

Thank you in advance for your help!