You should enter the command in your odoo server folder. I use window so my set up is

Odoo/18/server

Note that you will need to check will need to check where the package is installed.

In my case, it says that the package was installed sucessfully but I still had an error.  It turned out that it was installed to my global python folder (Python312/lib/site-packages) instead of my Odoo environment.

I copied the two folders phonenumbers and phonenumbers-8.13.53.dist.info to my Odoo  (Odoo/18/python/Lib/site-packages) and it seems to work.

Hi jason, 

Ok, and where should I enter this command ? 

It might missing package: phonenumbers

pip install phonenumbers

or double check installation of requirements.txt

pip install -r requirements.txt