I have reset password, after receiving Email on new password
Tried it same message "Incorrect user and password"
On all my other devices I can login OK.
Tried several times on faulty login tablet, with new password and changed to my password. Still same and others OK.
Posted problem on other XDA Groups. No fix.
Need to contact XDA ADMIN,
By the way, using same tab and logging on via Chrome, or other Login OK. Just an issue with XDA APP downloaded and installed several times on T330. NO GO.