IOS connection to Home Assist

[Blade137]

Hope someone has a quick answer, which will stop me going around in circles.
New to home assistant and have successfully installed it on raspberry pi3.
Have access via laptop both local and remote (using duckdns)
Also have remote access from my iPhone and iPad (again using duckdns).
The problem i have is adding additional iPhone !
When setting up app (on new device) and asked to Enter URL to connect, by entering https://xxxxxxxxx.duckdns.org:8123.
All seems OK as i get Home Assistant Login page asking for Username/Password.
But when i enter details i get the following error.

Also checking the log in Home assistance I have following:-

Can you have multiple iPhone ? What am i doing wrong ?

regards