How to generate 3d scatter plot with different colours for labels?

I have used TSNE in MATLAB for dimensionality reduction of a large data. I have been able to generate the Scatter Plot for TSNE in 2 dimensions which shows the labels of the cluster in different colors for each label, but, I am unable to do so in 3D. Referring to https://uk.mathworks.com/help/stats/tsne.html, I used the following syntax:-

Where, merged_data_all is a 21392x1974 table with the last column named FunctionalGroup containing different labels (similar to the Fisheriris species labels in the Mathworks example on tsne). Y2 is the 3 dimensional variable which I have been successfully able to generate of dimensions 21392 x 3 double.

figure
v = double(categorical(merged_data_all.FunctionalGroup));
c = full(sparse(1:numel(v),v,ones(size(v)),numel(v),3));
scatter3(Y2(:,1),Y2(:,2),Y2(:,3),15,c,'filled')
title('3-D Embedding')
view(-50,8)

When I use this code, I get the error "Error using sparse- Index exceeds array bounds". I even tried to use a modified version of the code and doing something like this

scatter3(Y(:,1), Y(:,2),Y(:,3),merged_data_all.FunctionalGroup)

In case of this, I get the error "Error using scatter3- Input arguments must be numeric, datetime or categorical". I am quite confused as to how I can plot a 3d scatter plot, with 14 different colors (for the 14 types of different labels I have in my FunctionalGroup column of merged_data_all). Any help in this regard would be highly appreciated. Thanks.