Acess to git-repo doesnt+t work

git clone git@github.com:brave/brave-browser.git

returns

git clone git@github.com:brave/brave-browser.git
Cloning into 'brave-browser'...
The authenticity of host 'github.com (140.82.118.4)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no/[fingerprint])? yes
Warning: Permanently added 'github.com,140.82.118.4' (RSA) to the list of known hosts.
git@github.com: Permission denied (publickey).
fatal: Could not read from remote repository.