Not able to login to Compute engine VM viw Web SSH

[Akarmarkar]

I am not able to login to the VM via SSH. 

I tried following approaches -

1. Web SSH - getting authentication failure.
   
   1. On running troubleshoot, it gives everything okay
2. Creating SSH key and adding it to metadata and VM ssh keys
   1. Getting permission denied(public key) error.

I have owner level permission assigned to my profile.

Help me to solve this issue