Please follow these next steps:
Verify you have entered correctly your username and password.
Verify there is a stable Internet connection on your mobile phone.
If your user has just been created, you must first confirm the verification e-mail in your inbox.
If you have forgotten your Login details, follow the “Forgot My Password” step.
Verify your user was not disabled / deleted by an Administrator.
Please confirm it with the owner of the account- Enable\disble user.