Please define what ‘not working’ means. Does it throw an error? If so, copy all the red text from the Command Window to a Comment to your original Question.
In the interim, you could have your own ‘plot3’ funciton or variable that is confusing MATLAB.
To determine that, run this:
which plot3 -all
from the Command Window or a script.
The only result should be:
built-in (C:\Program Files\MATLAB\R2021a\toolbox\matlab\graph3d\plot3)
or something similar. If there are othe results, that points to the problem, and the solution is to re-name the others.
