Can't log into home app - error #43401 - XFinity

Oddly, my credentials work when logging into the Xfinity TV app but do not work when attempting to log into the Xfinity Home app. I'm on an iPad.

It keeps telling me "Please sign in with the email that you provided at the time XFINITY HOME was installed. Error #43401."

I have no other email that I ever used with Comcast so I don't know what to do. And I know I'm using the right username / password combination because it works in the TV app and in the browser on my desktop.

Please advise, thank you!

This question, "Can't log into home app - error #43401," is about XFinity-Comcast TV Television Apps.

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