After installing MATLink, I tried the running the following cells in Mathematica:

Needs["MATLink`"]
OpenMATLAB[]

and

MEvaluate["mat = magic(4)"]

But nothing showed up in the output cell.

Then I tried

mat = MGet["mat"]

and the output says

$Failed

Does anyone know why this might happen?

I think I have properly installed MATLink. I followed the steps mentioned here https://mathematica.stackexchange.com/questions/307780/installing-matlink, and I have registered the default MATLAB version by running regmatlabserver in MATLAB. I'm using Mathematica14.3 and MATLAB R2025b, both of which are 64-bit.