How do I add SSH keys to my Droplet; when I thought I already did? (Error Message below)

Add correct host key in /Users/{$Username}/.ssh/known_hosts to get rid of this message. Offending ECDSA key in /Users/{$Username}/.ssh/known_hosts:5 ECDSA host key for {$IP_Address} has changed and you have requested strict checking. Host key verification failed.

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After reading through documentation I was able to get it working. Thank you @JonsJava

Rather than adding it to known hosts, you will need to add it to authorized_keys:

echo "$key" > ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys