Try a new circuit to see if that works but the best way would be not to use any of those forms and look for an email that you can contact from your email client.
Is this not simply a case of third party login flows being isolated with FPI (first party isolation)? I mean fbnet (or whatever the domain is for facebook authentication) is not the same eTLD+1 as myfxbook
Finally I found solution in myfxbook access.
I use ‘android FireFox 68.11’ (last old version compatible with Android 4 kitkat) and android ‘VPN Proxy Master Lite’ (US Washington server)… it works very good.
but anyway, I still prefer PC Browser.
So, why myfxbook rejecting Tor Browser from accessing it?..
What code inside Tor server?..
Is it possible in next version, Tor Browser compatible with most website (including this myfxbook)? Because I like Firefox (compared than Opera, Chrome and else)…