Accessin HA externally from ios device

Hi All - first post and feeling a bit daunted as I step into HA - but too excited not to as it looks like the solution I’ve been looking for.

Have managed to get HA up and running on Raspberry PI and today followed instructions using DuckDNS and port forwarding to gain access away from the home. This was successful when I tried to log in on a mac from outside my home network.

But on my ipad & iphone, I can’t get the app or browser to connect (not using wifi but the sim card).

Error:

Logger: homeassistant.components.http.ban
Source: components/http/ban.py:124
Integration: HTTP (documentation, issues)
First occurred: 8:13:32 PM (16 occurrences)
Last logged: 8:47:22 PM

Login attempt or request with invalid authentication from 148.252.132.43 (148.252.132.43). (Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/91.0.4472.80 Mobile/15E148 Safari/604.1)
Login attempt or request with invalid authentication from 148.252.132.43 (148.252.132.43). (Mozilla/5.0 (iPhone; CPU iPhone OS 14_6 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.1.1 Mobile/15E148 Safari/604.1)
Login attempt or request with invalid authentication from 85.255.233.48 (85.255.233.48). (Mozilla/5.0 (iPad; CPU OS 14_4 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) CriOS/90.0.4430.216 Mobile/15E148 Safari/604.1)
Login attempt or request with invalid authentication from cpc115884-addl5-2-0-cust2394.6-3.cable.virginm.net (86.25.185.91). (Mozilla/5.0 (iPhone; CPU iPhone OS 14_4_2 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/14.0.3 Mobile/15E148 Safari/604.1)

Really not sure what to try next!