Facebook button is missing from Iphone Blynk app

[Neo2a]

Dear all,
My project works since 2018 but from last weekend I cannot enter to
because missing Facebook login button from Blynk app main screen.
How can I solve this problem?
I could enter to this forum with facebook button on PC website.
Maybe facebook login works well.
Thank you.
Steve

[Gunner]

Can’t login on the app

I cannot log in via Facebook because there is no more the button in the app. I tried to reset password but the e-mail does not arrive Blynk legacy app (but also Blynk and Blynk myPlant) on iOS all up to date. Already tried to reinstall apps and reboot phone iPhone 12 pro max connected on both working 4G and WiFi. Cloud server needed. I don’t think library version and hardware is needed since the problem is app login.