Log in problem

Hello, I am getting  "you need the official whatsapp to use this account android" when i try to login in WhatsApp using my number. I downloaded WhatsApp from official Play Store. I even tried downloading apk from official website and installing. I even formatted the phone and tried again. Still i am getting same results. I tried contacting WhatsApp support but they are saying to use official WhatsApp. If someone know how to resolve please help me out. 

i cant log in i try to login and error is “unable to authorize “ then i try to log in on google and it work pls help.

I logged out of Facebook on every device, because I changed my password. I also pressed X on every recognisable device, just to make sure, that I haven't left Facebook somewhere logged in. And I have had set two factor authentication on. Now I can't log in, because it asks me for 6 digits code, which can only be retrieved when logged in.  I am using same phone and same 2 computers to log in, that I have used to be logged in for many years, but it still can't log in.  I sent my passport photo to Facebook support, but it only changed log in email, which doesn't help, because it still asks me to enter 6 digits code out of code generator. Please advise what I should do? I am logged out for a...

Hello,
I am trying to log in with my email id and the password , but since morning I get only one response and that is

You must log in to see this page.

Can any one please help me as to why is this happpening.

Best Regards
shazneenConfiguration: Windows Vista Safari 532.0

Hello,

I'm Sameer Ali. I wrote my username and password, then Facebook is notified me "you trying too often, please try again later." Please solve my problem please why it's not open?