I'm just trying to mentally picture the experiment. Were you hanging a bar magnet from a string and measuring whether it was deflected toward the sample? Or were you pressing the magnet against the container and trying to see if the solution itself was visibly deflected?

While the manganese ions themselves do remain paramagnetic in solution, the chloride ions and more importantly the water itself are diamagnetic. I doubt you could make a solution concentrated enough to see visible deflection of a bar magnet.

There are a few direct ways to measure magnetic moments like using a Guoy balance, an Evans balance, or the Evans NMR method.

Do you mind if I ask loosely why you're interested in it?