$ ssh -T git@github.com
The authenticity of host 'github.com (13.250.177.223)' can't be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no/[fingerprint])?
参照这个https://blog.csdn.net/cs23405/article/details/88242328
输入yes回车，还不行就重新git remote一下，还有可能你得SSHkey不对重新关联一下