Corrections - Genitive

Hi! Today I’ve written and sent for a check a text where I used forms like Lisas Freund to indicate possession. However, when I got corrections I was surprised to see it corrected and replaced with Lisa's Freund.
What form is the correct one?
I used to believe the first one was correct and it’s correct according to the rule, but still would like to clarify this moment.

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@marunyash
Obviously, that was our mistake. It’s definitely correct the way you wrote it:
Lisas Freund
We sincerely apologize for this mistake. :pensive:

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Thank you for the reply!