Could be deliberate, in order to force use of the "latest" browser versions, for "security"
I feel fortunate that Chase.com still works in Serpent (52 and 55) as long as I use a user agent spoof, and of course don't try to enable "Web Components." On Android, not so lucky; I have a "vintage" 2015 Android phone which still works (even survived AT&Ts shutdown of their 3G network) except for the Chase app. The last Android 6 version of their app has been blocked for many moons. Never mind; I can still use Chrome - oh wait, Google just stopped updating Chrome on Android 6 too, so those days are numbered too. At least I got all the way up to Chrome 99 first (maybe Android 6 can't handle a 3-digit version number )
Assuming the phone continues to hold out, my last resort will be Firefox (probably FF 56 with, you guessed it, a UA spoof).