Error while using E-utilities on slurm HPC
501 Protocol scheme 'https' is not supported (LWP::Protocol::https not installed) indicates that a specific perl module is missing.
If indeed your edirect installation is from March 2019 (as I interpret from e-utilities/03.02.19), you should update your edirect installation to the latest version. If you update, I expect the necessary perl module will be installed and the error will go away.