Currently, one-time bypass is only available for MFA server, and it is not available for Azure MFA. Our Product Group intends to add this feature to Cloud MFA. However, there is no ETA yet.
For the MFA Server one-time bypass you need an account with admin rights for the computer and Domain if applicable. Microsoft also no longer offers MFA Server for new deployments.
If you have fulfilled the prerequisites and it is still not working, feel free to send me an email with the details of your setup and scenario (will leave my email in a private comment).