If you ever receive a response when you try to connect to the SSH server after updating your ssh key, all you have to do is locate the .known_hosts file and delete the existing key and retrigger the ssh command. IF you have set up everything correctly it should open up.
ssh -i "id_rsa" user@ec2.IP.eu-west-2.compute.amazonaws.com
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@ WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED! @
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IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:sfgsfdgsfsdfsdfqJdvw.
Please contact your system administrator.
Add correct host key in /c/Users/username/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /c/Users/username/.ssh/known_hosts:1
ECDSA host key for ec2-ip.eu-west-2.compute.amazonaws.com has changed and you have requested strict checking.
Host key verification failed.
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