I bought an HTC Thunderbolt 3 weeks ago. Had no problem at all setting up my 3 different Yahoo Mail accounts on it.
Then 3 days ago I started getting an error about authentication on one of the Yahoo accounts. I went into the settings and re-entered the PW but every time I get "Authentication failed." How is this possible!?! I know the correct PW. I log into Yahoo webmail 10 times a day w/ this PW.
I tried changing the Yahoo PW and tried the new one. Same error. I tried deleting the account on the phone. Tried setting it up from scratch. Still same error. This makes no sense. How can I fix this?