Holiday is imported in deployment but script claims "no modules named holidays"

I put as build command “pip3 install holidays openpyxl pyuploadcare”
Shell says “Installing collected packages: six, python-dateutil, holidays, et-xmlfile, openpyxl, pytz, typing-extensions, dnspython, idna, email-validator, pydantic, h11, exceptiongroup, sniffio, anyio, certifi, httpcore, httpx, pyuploadcare”
Yet when client asks server to launch the python script I get a HTTP 500 Error with pay load "Traceback (most recent call last):
File “”, line 3, in
import holidays
ModuleNotFoundError: No module named ‘holidays’
exit status 1

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