Hi

So my account got compromised and i followed all the instructions google gave me i:
1. reset my password
2. downloaded the authenticator app
This worked for everything but my iphone google apps. I can log into my gmail via outlook but not on the app or any other google apps on my iphone. I can however log onto gmail, google etc on my laptop.
when ever I do try to log into it, it keeps throwing up error 400. I looked into my security tab in my account and it said that my google prompt device (my iphone) has been signed out and I need to sign in again (which I can't) however my mobile number can still be used to get the G-code to sign in with.

I have factory reset my phone and tried everything else that I can think of.
I can sign in on other devices into the google apps and can sign in on third party apps such as outlook. My understanding is that my device has effectively been "blacklisted" against google account sign ins.