Have you installed with OVA or ISO here? Sometimes this occurs if the home page of user root is set to /root/git/mercury/install/amp-install.
Since the SSH doesnt work we would need to use the live CD option to check on this. You can try out the below steps,
Mount the iso of Airwave and type "linux rescue" when you see the install screen and pass all the initial phase(like selecting language) then choose the option shell.
Type below command to enter "/mnt/sysimage"
#chroot /mnt/sysimage
This occurs if the home page of user root is set to /root/git/mercury/install/amp-install. Please use the below mentioned command to check this:
#head -n 1 /etc/passwd
root:x:0:0:root:/root:/root/git/mercury/install/amp-install
Please use the below mentioned command to switch the home page to /bin/bash
#sed -i "1s/.*/root:x:0:0:root:\/root:\/bin\/bash/" /etc/passwd
Please run the below mentioned command to setup ampadmin credentials(You may exit linux rescue mode and login as root and execute this command)
#setup_ampcli
You will now be able to login using the new ampadmin credentials
If you need help or clarification for the above steps i would suggest opening a TAC case, so that they can guide you over a call/session.