Are you connected to the internet? Haha, seriously however, are you?
Thinking you have the appropriate login e-mail and password (and also you're attached to the net) there's a few things that might be triggering your issues:
Can't Login My Facebook Account
Are you getting an error message? If so, inspect the Facebook help page for descriptions and fixes to recognized concerns.
Make certain you don't have any extensions or antivirus programs running that are blocking Facebook.
Have you tried getting rid of the application's cache? Most likely to Settings > Apps > Facebook > Clear Cache. If this does not work you can try clearing up data too and as a last hope uninstalling and also re-installing the application completely.
Did you join your phone number? Make sure you type in the nation code as well when logging in.
If the app is telling you to update your e-mail address, this is probably due to the fact that your e-mail server is labeling your Facebook emails as spam.
If you've recently enrolled in Facebook you may need to validate your account first. If you've recently changed your password, see to it you're trying to visit with the brand-new password and not the old one.
If you're logging in using a browser, make sure you have cookies allowed and that facebook.com is added to your list of risk-free websites.
Make certain you have the most recent variation of the Facebook app for Android.
