Is there an official online elo fide?
I believe it is something called fide online arena, but you got to play otb to get fide rating.
fide online arena, you can get "arena fide titles" - which are basically worthless and just a cash grab
as said above there is fide online arena and rating from there are published on one ones FIDE card but dunno whats point of it. In particular as it is close to defunct chess site.