I believe its an issue with lovelace. Loading the authentication page in browser (which you have to do both from the ios app to authenticate or from just going to the HA instance in the browser) just shows a blank page in my case. I believe ther are other posts on the forum about exacty this issue. Sadly it seems there isnt a good solution to this. OThers appear to instead use something like HADashboard and appdaemon or tileboard instead (presumably to get aroudn the issues with lovelace.
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