Developer Accounts are now deprecated and no longer supported. To continue, please create an Integrator type tenant /org. If you have existing OIN submission applications, contact Okta Support for assistance with migrating them. Learn more here: Introducing Integrator Free Orgs.
You may need to create a support case for more context-specific assistance.
Please ensure there have been no recent changes to your environment (Proxy, network level changes or ISP, gateway changes that modify admin IP) and try logging in using the default Login page with no customizations and default idp:
If that doesn’t resolve the issue, it’s possible that there are policy restrictions in place or that the account has been locked. In such cases, you may need to consider creating a new account you can use +1 with your work email for that.