Cannot get copilot to use 4 spaces to indent Python

[kynnjo]

I have run all of the following:

    (setq python-indent-offset 4)
    (add-to-list 'copilot-indentation-alist '(prog-mode 4))
    (add-to-list 'copilot-indentation-alist '(python-mode 4))
    (setq-default indent-tabs-mode nil)

(My tab-width variable is set to 8, and that is where I want to keep it. Since I don't want TABs in my Python code, at all, this setting should not matter.)

To no avail: all the code that Copilot proposes still uses an 8-space indentation.

What else must I do to get Copilot to use 4-spaces/level for indenting Python code?