Instagram Login Error on Hathway Only

Hi. I am facing Instagram Login Error on Hathway Broadband only.

Whenever I try to login, it gives error like username doesn't exist, request error etc.

But as soon as I shift to Jio or Airtel or Vodafone, I am able to login fine.

Are you also facing this issue?

I get the same error on PC, Browser and Instagram App itself.

P.S.: I did kept my Hathway offline (off) for many hours to have the new Public IP. I tried with that too but same error.

You have to logout first to check.

Please check and confirm me.

Thanks.