Log-in to apps fails due to cookie settings?
I have an iPhone SE (1st generation) with iOS 15.7.3 installed (it doesn't update to higher versions anymore apparently). I have several apps on which I want to log on. If I try to do that, a browser panel opens where I should normally fill in my login details, but the browsers always say there is an issue. I think it has something to do with cookies enabled/disabled. I have tried every possibility regarding cookies in the Safari settings: both enable and disable cookies, cross-site tracking, ... and I have also deleted VPN settings. Nothing seems to work. I have resetted my iPhone to factory settings twice, and it doesn't work. Does anyone else have an idea please?
iPhone SE, iOS 15