ATT.net email and Yahoo email have password errors on Lumia 920
I have been happy with my Lumia 920 for about a year, and I have installed all the updates. In the past few weeks, I have had trouble with using my firstname.lastname@example.org account (Uverse) and my Yahoo account. They cannot both seem to exist on my phone at the same time. Except for an occassional enter your password request, this had not been a problem before. Now I can either have the att.net setup or the Yahoo, but not both - they attempt to sync, prompt for a password, then fail to sync. Both accounts work just fine from PC/Mac. I also have an exchange server (work) email and Gmail set up on this phone, no problems.
Attempts to fix include removing both accounts, adding them back one at a time, att.net first then Yahoo, etc, no luck. I can't find any other messages in the forum about this... Not the end of the world but I like to be able to fix things.