You made everything new but the IP address should be a new one, as well. The phone is not flagged, the IP is temporarily flagged, but the email is flagged.
This is the most recent update - for Supported Countries only (I suppose you are in one of them now):
- Clean your computer as much as possible;
- Change your IP address;
- Install a new different (clean) browser - no privacy, no extensions. The most accepted browsers are Brave, Chrome, Edge, Opera (all confirmed) - Firefox (not fully tested yet);
- Close everything related to the Internet and privacy, anti-virus with VPN, ad-blocker, etc.;
- Use the “flagged” phone for SMS confirmation code only - it is not “flagged” if you used it only once;
- Open a new Gmail email account (or Microsoft) - the previous email is “flagged”. Use the “(non-)flagged” phone for recover;
- Open a new OpenAI account - match all your data, phone, and email - wait for the confirmation code via SMS;
- IMPORTANT: Click on “Use my Gmail (or Microsoft) account” - allow to read all your account data - do not fill email/password;
If you find any issue getting the OpenAI account - publish or send in private more information about your system.