Hello @brazzmonkey .
iodéOS is not rooted after a default installation. Your banking app will probably misinterpret the custom ROM iodéOS and identify it as rooted, even though it is not.
Banking app usually expect stock Android with Google Play services. iodéOS, on the other hand, is equipped with the privacy-preserving mircoG and not the surveillance bug Google Play services. The microG services emulate Google Play Services and very many (banking) apps work with it, but not all.
If necessary, it helps to do without the online login with QR code when setting up the banking app for the first time and instead enter the login code manually in the form of numbers and characters, if this option is available.
Speaking of Root - MagisK. This tool, which has meanwhile been widely developed, makes rooting easier than ever, but - every coin has two sides, which should mean that a rooted smartphone can cause unexpected errors in the operating system, because after all, the elementary
boot.img file is usually manipulated. The consequences that may arise from this cannot be handled by the ‘normal user’. Please consider: Some smartphone manufacturers refuse warranty and guarantee in the case of manipulated firmware - and not without justification.