VBA Doesn't Work When I Share a workbook

So my VBA code works fine when I have the file saved on my computer but when I go to post it on sharepoint and share the excel file the vba code stops working. The text box pops up when select a cell in column C or D but then the textbox just stays on the screen and displays only the message from column D not from column C (I have two different messages identified for each column). Is there a modification to make the code work? I used the following code:

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