Create or Update Remote Record Action Uniqueness checkbox cannot be checked during subflow creation.

[html5lv2stu]

I am developing a subflow to create records on other instances using the Create or Update Remote Record Action.
However, when I click to check the "Determines uniqueness" box next to where I want to specify Fields, it is not checked.
I was able to check the box for actions that create or update records in my instance.
Why can't I check the box in the Create or Update Remote Record Action?

[GlideFather]

Hi @html5lv2stu 
Please, share screenshot or paste the error message, anythig

[html5lv2stu]

No errors. Clicking the checkbox in the red box does not check the box.

[GlideFather]

@html5lv2stu aha ok I see it now.

Well, cannot it be due to empty value? Or different scope? 

I will try to replicate in my end and play around with it

[html5lv2stu]

@GlideFather 

Sorry, I had deleted the original action and prepared it appropriately.
The target field is the auto-numbered “number” and the value is the “number” of the existing record retrieved in the flow.