Are you connected to the net? Haha, seriously though, are you?
Thinking you have the ideal login email and also password (and also you're attached to the internet) there's a couple of points that might be causing your issues:
Can't Log On Facebook
Are you getting an error message? If so, inspect the Facebook help page for explanations as well as fixes to well-known concerns.
Make certain you do not have any kind of extensions or antivirus programs running that are obstructing Facebook.
Have you attempted clearing the application's cache? Most likely to Setups > Apps > Facebook > Clear Cache. If this doesn't work you can attempt cleaning data too and also as a last resource uninstalling as well as re-installing the app totally.
Did you register with your contact number? See to it you type in the nation code too when logging in.
If the application is informing you to upgrade your email address, this is probably due to the fact that your email web server is classifying your Facebook e-mails as spam.
If you have actually just recently enrolled in Facebook you might require to validate your account initially. If you have actually recently changed your password, ensure you're attempting to visit with the new password and not the old one.
If you're logging in through an internet browser, make sure you have cookies made it possible for and that facebook.com is included in your checklist of risk-free websites.
Make certain you have the most current variation of the Facebook app for Android.