How to apply the white point when converting xyz to upvpl using 'makecform'?

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Salad Box
Salad Box 2023-1-10
Hi,
I have a sample data point with XYZ values shown below.
XYZ = [29.5400 25.2800 19.5900];
I would like to convert XYZ to Luv using 'makecform' with type of 'xyz2upvpl'.
My code is shown below.
cform = makecform('xyz2upvpl');
upvpl = applycform(XYZ, cform);
I then got the result
>> upvpl
upvpl =
0.2527 0.4867 25.2800
The result doesn't seems right to me since L = 25.2800 which is the same as Y which is also 25.2800.
There is no reason that L = Y. I must have done something wrong. Is it to do with the missing information on the white point? How can I define the white point for the type of 'xyz2upvpl'?

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