Log in via Android App

I am having difficulty logging into Service desk plus from the android app. I keep getting "Login Failed Username and/or password" provided is wrong.

I can log in locally and remotely via just web page from a pcusing HTTP.

I have the following setup:

Service Desk Version 9.0 Build 9024 (Free Version) 1 Technician only(Administrator)
Static IP for remote access and 8069 as my port on protocol HTTP

I read some other posts where they mention that you have to generate an API key on the technician to enable login via the andriod app.

As mentioned above I only have the free version and this allows only 1 technician with login rights which is the default administrator. The administrator does not allow you to create an API key (Not sure if it is pre-generated for this user)

What I tried to do is add another technician, this allowed me to generate an API key for this new user, I then had a problem whereby I could not remove the default administrator account so as to enable login on the new user.

Are you able to use the default administrator to login via the andriod app?
If not can I delete the default admin and make the new technician the only login user?

Your assistance is greatly appreciated.