(Still) Locked out of account due to 2FA "Sign in policy denied access"

Summary:

In the course of setting up 2FA for my account I got logged out and now it gives me the "Sign in policy denied access" error whenever I try to login again. I've been having this issue for months now and I'd appreciate any help.

Content (required):

This is the same issue discussed in this thread but it has not been resolved yet: https://community.oracle.com/customerconnect/discussion/651454/locked-out-of-account-due-to-2fa-sign-in-policy-denied-access#latest.

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