Surprise, surprise... ledger nano s memory space is reduced yet again from 144kb to 138Kb, that means that ledger lied before when they said that space reduction is only temporary.
That is incorrect. I've made a screenshot, search does return Fido U2F.
It was not incorrect, because even ledger engineer developer/moderator confirmed that FIDO app was NOT available:
The Fido application is back in the Manager. We apologise for the short inconvenience, please let me know if you have been able to install it!
https://www.reddit.com/r/ledgerwallet/comments/r7gghr/comment/hn42yn4/?utm_source=share&utm_medium=web2x&context=3