Ok I figured out the answer, and I'd like to keep this here for the record for anyone else who may have forgotten this step.
Before you enter the function, it's important to select all the cells you will need in the inverse! For example, if you are trying to invert a 3x3 matrix, you must first select a 3x3 output range before entering the MINVERSE
formula.
After you select the cells to represent the entries in the inverse matrix, then you enter the formula into one of them and press Ctrl+Shift+Enter simultaneously.
This should work.