If you are trying to using Power Automate and following "I Am Lu" s Tutorial and you get a Bad Gateway error in your power automate. The Key was not made correctly. I am not sure if it is because I am on a Mac and Lu is on a Windows but if you want the flow to connect to AWS then run the below command in your terminal to get the correct SSH Key.
ssh-keygen -m PEM
The key should start with:
-----BEGIN RSA PRIVATE KEY-----
not
-----BEGIN OPENSSH PRIVATE KEY-----
Thank Lu for the awesome tutorial https://www.youtube.com/watch?v=VW6gqVsvOeQ to get the flow to work. :)