My Ec2 instance is not working

Hi! Could you please give us more details? Like what's the error dropped by the instances, what EC2 instance types are you using, and things like that.

This is the error denoting Failed to connect to your instance EC2 Instance Connect is unable to connect to your instance. Ensure your instance network settings are configured correctly for EC2 Instance Connect. For more information, see Set up EC2 Instance Connect at https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-instance-connect-set-up.html.

Currently i am using the Ubuntu 20.04 as my AMI.

have you checked on the below troubleshooting documentation:

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/Connect-using-EC2-Instance-Connect.html