If you don't have a number in your user name - change your user name on your desktop or laptop, add a number. Make that your new user name, then sign in on the phone. I spent weeks with Chase not being able to fix a log in problem, so I finally came up with this fix myself. My original user name did not have a number, but chase later required a number. Original worked on desktop, but stopped working on mobile. Don't know if this is your situation, hope this helps.
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