Are you checking for LWP::Protocal::https with the same perl you are using for the CPAN calls? I've hit this error in the past where the cpanm call was using the system perl and not the intended perl (I forget if that was perlbrew, homebrew, msys2 or some other source).

In reply to Re: LWP::Protocol::https is installed but pinto fails with "Protocol scheme https is not supported" by swl
in thread LWP::Protocol::https is installed but pinto fails with "Protocol scheme https is not supported" by Intrepid

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