Excel 2016 - Errors detected while saving

Hi,

Our company recently upgraded our shared online environment to Office 2016 which has now caused severe issues on a Macro enabled file accessed a large number of people.

The error I am getting is the following:

Errors were detected while saving 'XXXXXX' Microsoft Excel may be able to save the file by removing or repairing some features'. I have attached an image

It is a large workbook with a large amount of Command Buttons, Macros, Data validation etc and so I don't even know where to start with trying to identify what is causing this issue.

Is there a VBA code I can run which will tell me what is causing the error when trying to save?

Many thanks in advance.