'How can I delete another person's trigger on a google apps script project?

My coworker has left his position in my company, so I'm trying to avoid any problems with our scripts when his account got deleted. I'm trying, without success, to delete his triggers on our apps scripts projects. I tried with my personal account, with a drive admin account and with deleteTriggers() function, and was unable to do with at all.

Can anyone help me with this?



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