It is very likely that I didn’t get a proprietary one as I did not realize that was important. I will look around for one and see if it helps, thanks.

You might be right about the cheap knockoff. I just grabbed one on Amazon not realizing that they would be so finicky. I am new to this type of pen and so thought some of this was standardized. I will try to find an official one and after cleaning the nib as another poster suggested give it a try.

Thanks for the suggestion, I will definitely try that and see if it helps.