Facebook – Login Error – An unexpected error occurred

Having the above error? Getting the same thing on your phone, Firefox, Edge or Chrome desktop browsers? Tried the web and that suggests deleting your cache, deleting the app but still you get the error?
Do you have one machine that still can log into Facebook? If you do then go and turn off, I know this is unsafe, 2FA (In my case my mobile and email systems). Now, no need to clear your cache, just log in as normal and job done!
You can now turn 2FA back on. What’s the point of 2FA if you have to turn if off to log in? No idea! I received two SMS messages, from Facebook, while 2FA was on, but no opportunity to enter any of the codes received.
Maybe this was all just a “glitch” on the day and will go away tomorrow.