Hello Dennis,
Thanks for reaching out to the Google Ads Scripts team.
It appears that I was able to make changes to a negative keyword list at the MCC level, as per my testing. Could you please try to run your script at the MCC level (without selecting/accessing any sub accounts) and see if that solves your issue? If the issue would persist, please provide us with the following information for us to investigate further:
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Google Ads Scripts Team |