I use the stock e-mail app on the M8 since I have several accounts over various servers and it allows them all to be grouped together regardless of where they come from. We had to reset the password on one of the g-mail accounts yesterday and the e-mail app is not logging onto it. At first it came up as an invalid account so I changed the password in the settings and nothing. Then I deleted the account and was going to start over, but I get the same message 'authentication failed, please check username and/or password'. I've checked, everything is correct, but it won't log in.
Does anyone have any suggestions? I've had this account on this app since I got the phone with no issues. My wife uses the g-mail app on her M7 and everything went through just fine on her phone right after it was changed. I've restarted the phone, I've waited overnight, nothing I do seems to work. It as if the app can't contact the newest info from Google, so it knows it needs a new passwords, but it doesn't know what it is. Usually setting up an account only takes a few seconds, but this one is being really stubborn.