It appears that CPAN is configured to check module signing signatures, and that it expects to do so with key-id 93B84C15, but that key has not been imported into your GPG key-ring. When you say "exported a key to the default server," exactly what did you do?

In reply to Re: cpanp install, gpg: Can't check signature: No public key by Anonymous Monk
in thread cpanp install, gpg: Can't check signature: No public key by QM

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