Elitebomer

I have been trying to help my sister log into her account on the launcher. I am able to log into regular minecraft launcher with the information and play the game but when i try to log into the Technic launcher it say that the account has invalid login credentials.. I have been trying to figure some reason out for 3 days now as to why it work but i cant figure anything out. the accounts purchased the copy of minecraft through the xbox pc application