That particular key is mentioned in the "bug report" here. You could follow the instructions in there to proceed.
It's also worth reading the background to all the changes in 2.29. I take it that your previous CPAN version was older than this.
The current PAUSE public key is always available at https://pause.perl.org/pause/query?ACTION=pause_04about#pubkeybat if required.
🦛
In reply to Re^3: CPAN Installs Failing On gpg
by hippo
in thread CPAN Installs Failing On gpg
by blbates
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