I am working on Sitecore.NET 9.1.1 (rev. 002459). Yes I have added unique List Signature fields value in both PageList and Pagination components. I have created a Page Design which has column splitter component. In column 1-1 I added page List and populated the data from an Item Query using the Component Editor Field Source Type. I didn't set any value to the Field Page Size. Below that I tried to put a Pagination Component in the experience editor but it asks to add the associated content but there is no component to add there. Below is the screen shot. So I added it from Content Editor in Presentation -> Details and added Field Collapse Pagination Threshold to 6 (I have more than 6 elements in my Page List).
Then I mapped both these components using unique List Signature field value.
But it is showing all the Page List elements and No Pagination on the Web page.