The Jagex Account experience on iOS is subpar. Every login requires an MFA code (which was not advertised as a requirement). This minor irritation is exacerbated by the fact that there doesn't seem to be support for switching accounts (unlike the desktop Jagex Launcher). Switching accounts requires completely signing out, then back in with another MFA code. On top of this, every login is sending me an email alert for a login from a "new device."
I regularly play two accounts almost exclusively on mobile, and was very much looking forward to the Jagex Account making this easier. Unfortunately, it has done the opposite. Mobile needs to either support account switching while staying signed in or have an approved device list where logins from said list do not require MFA. And for the love of god, stop the never-ending "new device" alerts.
Tech notes: iPad Pro (12.9"
(6th Gen); iPadOS 16.3.1; Runescape iOS version 928.1.