Hi Archimagus,
I read that Ultibo got the same problem, you’ll find it when you search iPhone on the forum. This was her/his conclusion:
workaround
in the file /usr/share/ssowat/portal/assets/js/ynh_portal.js if you disable the function init_portal_button_and_overlay() line 251 the overlay is disabled and the bug is not reproductible on iOS anymore
(I disabled the function by adding a “return;” on line 253
Thanks for your help !