Hi I just sent out a lot of invites to my shinyapps.io private app a few users are saying whenever they click the invite link and enter their email and pw, the mouse hover turns into a red "nope" cursor and they can't click Sign Up. I removed their invite, sent another one, and I watched on a screenshare as she got it, went there, and the same exact thing happened. Most users are getting in fine. The one user I talked with tried it on IE and Firefox, no dice. She says her password is a decent proper one with letters and numbers. It didn't seem super long or super short when she typed it.