iPhone 12 is not loading SOME apps
Some apps, like MagCast and digital magazines that use the MagCast platform to publish on will not load, while all my other apps load perfectly. I have contacted MagCast Support and they assure me the problem is on my side, because they have 3 million viewers of publications on their platform. If the problem was on their side, their InBox would be exploding with emails asking what's wrong. I am the only one to ask for help. I have already tried other instructions about this on the internet, like briefly holding the volume UP button, then briefly holding the volume DOWN button, then holding the side button for longer than 20 seconds, but all that achieved was me dialing "Emergency Call".
iPhone 12