I spun up a new instance using this AMI:
099720109477/ubuntu/images/hvm-ssd/ubuntu-jammy-22.04-amd64-server-20220420
However, whenever I try to connect using putty I am prompted for a username. I enter "ubuntu" but I'm then disconnected with the message "Server refused our key" (see attached screenshot).
When I do everything the same using the 20.04 ami it works.
Working AMI from here:
099720109477/ubuntu/images/hvm-ssd/ubuntu-focal-20.04-amd64-server-20220419
The working version is exactly the same. Same EC2 settings (network settings, security group, keypair, etc) and same putty settings (just a different IP address).
I've tried everything I can think of, but cannot find a way to connect to the new 22.04 instance.
Do I simply have the wrong username (i.e. is it something other than "ubuntu")?
(Solution posted on behalf of the question author, to move it to the answer section).
It turns out that the problem was just that I needed to upgrade to putty-0.77. The error message was sending me in the wrong direction.