Hi Sweety,
Thank you for posting your query in our community.
Based on your description, the linked Excel data can't be updated in Word document on Mac. I tested it on my side, however, there was no problem.
May I know that whether you inserted Excel data in one of the following three ways: Link & Keep Source Formatting, Link & Use Destination Styles, Paste Special… > Paste link > Microsoft Excel Worksheet Object?
If yes, then please go Edit > Link… > to open the Links page, select Automatic update, and then click Update now, will these Excel data been updated successfully?
If the problem persists, could you please create a new Word file and link Excel data in it to see whether the problem happens again?
Best regards,
Jazlyn