SSH authentication failure on server

Hi all,

We are having an SSH authentication failure with some routers with a message like this.

(svc/vDAomVnG2MmMHbRhqh5Gy4/ssh:10/ssh): User authentication failure on server; username='myuser', gateway_user=''

After some investigation we noticed it's because of the password prompt. the routers are returning '"root@router_ip's password:"

And SPS is not recognizing the prompt so it closes the connection.

Can you help with this please.