get-poetry.py works, but install-poetry fails with certificate errors on Ubuntu 20.04 LTS

Hi,

I'm behind a corporate SSL-inspecting firewall with our own certificates.
I have them installed properly on my machine (with update-ca-certificates).
cURL works on HTTPS sites, and installing poetry via get-poetry.py works.
However, trying to install it via the newer install-poetry throws SSL errors:

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))': /simple/poetry/
WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))': /simple/poetry/
WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))': /simple/poetry/
WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))': /simple/poetry/
WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))': /simple/poetry/
Could not fetch URL https://pypi.org/simple/poetry/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/poetry/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))) - skipping
ERROR: Could not find a version that satisfies the requirement poetry==1.1.13 (from versions: none)
ERROR: No matching distribution found for poetry==1.1.13
Could not fetch URL https://pypi.org/simple/pip/: There was a problem confirming the ssl certificate: HTTPSConnectionPool(host='pypi.org', port=443): Max retries exceeded with url: /simple/pip/ (Caused by SSLError(SSLCertVerificationError(1, '[SSL: CERTIFICATE_VERIFY_FAILED] certificate verify failed: unable to get local issuer certificate (_ssl.c:1131)'))) - skipping
WARNING: There was an error checking the latest version of pip.

I set the certificate folder to REQUESTS_CA_BUNDLE (although I don't think requests is being used)
I even added our certificates to the certifi cert bundle file, but no luck...
This one has me completely stumped, since get-poetry works fine and both seem to use urllib...
Corporate SSL inspection is such a PITA for python...

So sánh script install-poetry mới hơn với get-poetry.py và tái hiện lỗi chứng chỉ trên Ubuntu 20.04 phía sau tường lửa doanh nghiệp kiểm tra SSL. Điều tra cách trình cài đặt và các lượt tải gói của nó sử dụng cấu hình chứng chỉ cục bộ; hoàn thành khi quá trình cài đặt thành công với các chứng chỉ được máy tin cậy.