What makes lsp work in one project but not in another

[RidaAyed]

I have two projects.
In one I'm unable to use lsp functionality e.g. lsp-help (no errors whatsovever, just nothing shown).
It differs from the working project by it's python version.
Specifically, they differ in Pipfile.

Working:

[requires]
python_version = "3.8"

Non-working:

[requires]
python_full_version = "3.9.2"

Any ideas what's stopping lsp-pyright from working in 3.9.2?