2FA gpg authentification?

[trap trip]

Hello

I  use linux, ubuntu budgie.For my mail i use thunderbird 60.3.0 and also mailfence, would like to know how to use gnupg in case of 2FA gpg authentification? Let me explain, i need to read a message crypted with my public key,i didn' receved this message by email it is online and i just need to read it to finish the 2FA gpg authentification. so my question is how to import this message an read it with my private key?

Thank you for all help

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