Hi,
Could you provided the detailed build number of the Mac OS and Office for Mac you are using, so that we can try to test it in our environment?
Besides, I'd like to clarify the following questions:
Did you get any error message when it failed to save or save as?
Does the issue occur when creating and saving a new file or only when editing and trying to save an existing file?
Does this issue happen to other Office programs, such as Excel or PowerPoint?
In addition, some users were able to fix a similar issue via uninstalling and then reinstalling Office, you may also have try.
Regards,
Steve Fan
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