You do not have permission to save files to this location.
Make sure that you have write access for this location, or select a different location.
I am at my wits' end with this.
Max OS Big Sur
Exel Beta channel.
ALL my Macs Pro, MacBook Air, Mac Mini, but NOT my DELL Win 10 Pro.
On one I saw a message saying the admin does not allow me to edit on macs, but I can save to off local disk locations.
I have checked write permissions, but in any case given this is across all mac I suspect something in my MS 365 setup, which I have not knowingly touched in ages. I CAN save the file as long as I do not attempt "save as". I can save as csv or xls just not xlsx
Other apps can save.
Do hope someone knows the answer - google suggests all the usual suspects like info/permissions etc, but this worked and suddenly does not, across all my Macs; so that suggests it is Excel related from the admin control?