API two-factor authentication

Please tell me about the specification of API two-factor authentication.

Please let me confirm if the following settings are possible.
1) The F2M API authenticates the user only when both the ID authentication and the client certificate authentication match.
2) The F2M API authenticates the user only when the client certificate authentication match.

Who is the client certificate issuer?
Codomo or Sectigo? Is there any effect of switching to Sectigo?

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