I've been using the FiOS Mobile app for Android for months with no issue on my Samsung Galaxy Note Pro 12.2
Just a few days ago, I started to get a sign in error S2-99 Invalid User ID and/or Password
I can still login to my FiOS account on verizon.net and my email account so I know that's not the issue.
Is anyone else experiencing this issue? I've searched and can't find any info.