iPhone Xr Os 15.2.1 HA app not logging in

I am very new to HA and have managed to install the server on a Pi, at last…
The HA app opens on my iPhone and finds the server but it will not let me log in. It tells me my user name or password are incorrect.
I have created a new user on the Pi HA with user name Test (test) and password test (BTW is the user name case sensitive - have tried both).
Still I can’t log in.
At one time I ended up having to edit the HA Pi files to remove the first setup credentials as again I could not log in from my laptop. I managed to get back to HA on my laptop, just more problems with HA access.
Does anyone know what I’m doing or have done wrong that is stopping me being able to log into HA on my iPhone HA app?

Regards,

Bob…

BTW,

I can log in to Test Test (test, test) on my laptop…

Bob…