I've looked in a lot of places for this information, and have turned up very little.
I have an Azure Linux VM. I use SSH to access it, and I provided public RSA key for that during deployment.
I now need to remote access it over SSH from another machine. But I have been unable to find information on how I can add a second public RSA key to it. The information I kept seeing was that it can only be accessed with one key. Is this correct, or can I use ssh-copy-id to send another public key to it from the 2nd remote computer I would like to access it from?