Can you please help me look at what i am doing wrong and advise me accordingly

thor@jumphost ~$ sudo su -

We trust you have received the usual lecture from the local System
Administrator. It usually boils down to these three things:

#1) Respect the privacy of others.
#2) Think before you type.
#3) With great power comes great responsibility.

I’ve done very little with KK Engineering, but if I understand the error, you need to create user mariyam on the App Server, not the jump host. So you need to ssh into the App Server before you do this.

Thanks so much. Please can you help me with the code for that? Thank you.

Does it look like this:
ssh strapp03_172.16.238.12

I don’t know, TBH – haven’t done much with it, as I said. Have you tried the KKE wiki?