Hi there,
This is likely related to the changes we’ve been making to require admins to use a 2nd factor when accessing the Admin app (as announced on banner on this forum and the following article).
If you have a paid account with Okta, you can reach out to support (via phone, since you wouldn’t be able to log into the support ticketing system) for assistance.
If this is a Developer Free org, unfortunately, support will not be able to assist you to reclaim access to this account as doing so would be a security liability. In this case, your only option would be to create a new org. Currently we have no easy way to remove your existing email from our system to allow for creation of a new org with the same email, so you would need to use a different corporate email when signing up for your new org.
Apologies for the inconvenience this may have caused!