ERROR: No matching distribution found for poetry==1.5.1

I had an issue installing on both Rocky Linux 8.7 and Ubuntu 20.04 LTS. Where the Official installer was failing to select a version that was available in the repo, and was just blindly trying to install v1.5.1. The solution was to specify a newer version of pythoon

Official instructions state the command to install is
curl -sSL https://install.python-poetry.org | python3 -

But this was resulting in Python 3.6 being used, which apparently is no longer supported. I had 3.9 installed on the systems.
The installer should really run a check to see if the python version it is using is too old and not supported and give an appropriate error. Alternatively, it could select the most up to date version that is available on that repo. Either way, it shouldn't fail with this error.

curl -sSL https://install.python-poetry.org | python3.9 - worked, but I wasted a fair bit of time working out why it was failing.

Start by reproducing the official installer command with Python 3.6 and compare it with the working Python 3.9 command described in the issue. Trace how the installer selects Poetry 1.5.1 and determine where an unsupported Python version should produce a clear error. Done means the old interpreter no longer fails with a misleading distribution error.