In this case, you will get a notification of not enough space even though there is enough space in reality. The second place is, where you already start the shrinking window but Shrink Volume is not available and greyed out. The first place is, where you right-click on the partition to click on the Shrink Volume button, but the Shrink volume button is greyed out. There are two places where you might face a greyed-out shrink button.
In this case, you will be unable to click the shrink volume button because it will be greyed out. There can three symptoms of this Shrink Volume error, which are: How we came to know that, Shrink Volume is not working. How Cannot Shrink a Volume Error look like?