I just noticed in a new installation of ISPCONFIG in ubuntu20.04 - add ssh user option in website tab is not showing. Never had that issue earlier, must be missing some thing. how to resolve it?
The "Shell user" option is always there for the admin, it can not be disabled for him. And for clients, it depends on if you allow the client to have shell users in his client limits.
I have it here in the menu on my system, and I checked the code, and it also looks fine. Try to log out and then log in again as admin. Is this ISPConfig 3.2.9? If not, update to 3.2.9.