[Python] boto3 client NoRegionError: You must specify a region error only sometimes

I have a boto3 client :

boto3.client('kms')


But it happens on new machines, They open and close dynamically.

if endpoint is None:
if region_name is None:
# Raise a more specific error message that will give
# better guidance to the user what needs to happen.
raise NoRegionError()


Why is this happening? and why only part of the time?

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