Problem with formula working in 2019 but not in 365

Hi, I am a new member. I am looking for an explanation, why a formula in Excel 2019 works, but does not work in Excel 365, which a friend of mine has. The formula is:

=WENN(C2>0;MINWENNS(Test!$B$10:$B$19;Test!$A$10:$A$19;">="&C2);MINWENNS(Test!$B$10:$B$19;Test!$A$10:$A$19;">="&(C2*-1)))

In my Excel 2019 everything is fine, but he gets #name in his cell. Can it be, that his Excel 365 does not know "MinWenns"? If so, can this be solved?

Is there any chance to write the formula in any other way?

Best regards
KnowNothing
(Germany)