Beginning June 5, 2022, the Multi-Factor Authentication (MFA) must be enabled on the User Control (URC) page of the TFNRegistry UI (tfnregistry.somos.com) for API Key users. For more information on how to set up MFA, please refer to the TFNRegistry UI: How do I Setup MFA? article.
If you want to use the TFNRegistry API without an API Key, you may do so without setting up MFA for your Login ID. You will need to enter in your Login ID and password.