The "Server refused our key" error is most commonly seen when the SSH command is malformed.
Check your SSH command against your "Servers" page, which contains the correct path to H into your servers. To access your "Servers" page:
1. Sign in to Acquia Cloud.2. Select your application, then the relevant environment.3. In the menu to the left, click "Servers."
Read more about accessing your "Servers" page
See also:
SSH and RSA key warning: Remote host identification has changed
Managing applications using the command line