Hi P,
Thanks for posting in the community.
I understand that you have an issue with the Excel app while using Save As feature, as we can't reproduce the problem at our end and for moving forward, we need more detailed information about the situation you meet. So, kindly share us with the information below:
a. Can you use Save As feature and save the file to a different location?
b. Do you encounter this error only for a specific Excel file or any Excel file?
c. Excel app version. Open Excel app> Account> Take a screenshot and share with us
d. Do you encounter similar behavior with different Office apps such as Word, PowerPoint?
Thanks for your cooperation. Meanwhile, we will start analyzing the question so we can work out the solution/figure out the answer as earliest as we can.
Best Regards.
Chitrahaas