Can you put company name on Resume even if it was an informal internship with people who work there?

For example, if you did an informal internship with a partner at Mckinsey where you helped him on consulting projects but are not in Mckinsey's HR system because it wasn't an official internship and you weren't paid, can you put the company name McKinsey on your resume?

Not sure what to do, don't want to come off as lying if this isn't allowed (note, my situation is not actually at McKinsey).

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