Facebook not. Working on iPad

I cannot use Facebook on my iPad, as it isn’t connecting to my wifi - tells me I have no internet connection. No Facebook help page will load either. Everything else on my iPad connects. Facebook also is fine on my iPhone SE and MacBook Air.

I have logged out but (obviously) cannot log back in; I have restarted and reset my iPad; I have uninstalled and reinstalled Facebook from my Apps on this device.

Is is this an Apple/iPad issue or a Facebook issue?