What I’ve done:

1. I rebuilt my droplet using the same key.
2. Setup my server following this https://www.digitalocean.com/community/tutorials/initial-server-setup-with-centos-7

What I’m trying to do:
I’m trying to log in locally using ssh user@xxx.xxx.xxx.xxx

The problem:
i get this error

Permission denied (publickey,gssapi-keyex,gssapi-with-mic).

just for the sake of trying i used sudo and got this error

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
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
Please contact your system administrator.
Add correct host key in /var/root/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /var/root/.ssh/known_hosts:1
ECDSA host key for xxx.xxx.xxx.xxx has changed and you have requested strict checking.
Host key verification failed.

Ive tried:

My console sshd_config file has

PermitRootLogin yes

PasswordAuthentication yes -just noticed theres two in the file both uncommented

#PubkeyAuthentication yes

Locally its the same as above but just one PasswordAuthentication yes

my authorized keys has the key listed
i can’t run ssh-copy-id so i did it manually
this is the error i get when i do so

/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: " ~/.ssh/id_rsa.pub"
The authenticity of host ' ' can't be established.
Are you sure you want to continue connecting (yes/no)? no
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
The authenticity of host ' ' can't be established.
ECDSA key fingerprint is 
Are you sure you want to continue connecting (yes/no)? no
/usr/bin/ssh-copy-id: ERROR: Host key verification failed.

ssh-keygen -R user@xxx.xxx.xxx.xxx

doesn’t work either, this is ther error i get

Host user@xxx.xxx.xxx.xxx not found in ~/.ssh/known_hosts

if anyone can help it would appreciate it very much as this is frustrating